The Partner as Secure Base - Bowlby's Theory
The "secure base" concept in John Bowlby's attachment theory is the most important theoretical framework for understanding the balance between independence and interdependence. A secure base is the "place to return to" from which a child (and an adult) explores the outside world. When a secure base is established, a person can safely venture out, try new things, and act independently. Conversely, when the secure base feels unstable, a person either stops exploring and clings to the base (becomes dependent) or pretends not to need the base at all (becomes avoidant).
In romantic relationships, partners function as each other's secure base. In a healthy relationship, the partner's presence provides "a sense of security," and on that foundation each person can engage in independent activities (work, hobbies, friendships). This is "exploration from a secure base" - a state where independence and interdependence coexist without contradiction.
Problems arise when the secure base becomes dysfunctional. When a partner's responsiveness is inconsistent (sometimes warm, sometimes cold), anxious attachment is activated and fear of separation from the partner intensifies. As a result, "dependence" emerges - sacrificing independent activities to stay close to the partner. Conversely, when a partner is intrusive (always wanting to be together, monitoring behavior), avoidant attachment is activated, producing "excessive independence" - the drive to create distance.
Self-Determination Theory - Reconciling Relatedness and Autonomy Needs
Deci & Ryan's Self-Determination Theory (SDT) identifies three basic psychological needs: "autonomy," "competence," and "relatedness." In the context of romantic relationships, reconciling the "relatedness need" (wanting to connect with a partner) and the "autonomy need" (wanting to be oneself, wanting to make one's own decisions) becomes the central challenge.
SDT research shows that these two needs are not inherently contradictory. Rather, the more autonomy is supported in a relationship, the higher the satisfaction with relatedness. That is, when one feels that a partner respects one's choices and values, the connection with that partner is also felt more deeply. Conversely, when one feels that one is sacrificing oneself to accommodate a partner (autonomy is being thwarted), the quality of relatedness also declines.
This finding suggests that "changing yourself for your partner" does not necessarily improve the relationship. Giving up hobbies or restricting friendships to meet a partner's expectations may avoid conflict in the short term, but in the long term, dissatisfaction from lack of autonomy accumulates and undermines the overall quality of the relationship. A healthy relationship is one where both parties' autonomy is respected and each voluntarily "chooses" to be together.
"Fusion" vs "Differentiation" - The Bowen Family Therapy Perspective
The concept of "differentiation of self" in Murray Bowen's family systems theory provides another important framework for understanding the balance between independence and dependence in relationships. Differentiation of self refers to the ability to distinguish between emotional reactivity and intellectual functioning, and the ability to maintain one's own beliefs, values, and goals while remaining in an intimate relationship.
In a state of low differentiation ("fusion"), a partner's emotions directly govern one's own emotions. When the partner is angry, one becomes anxious; when the partner is sad, one becomes depressed. Additionally, disagreements with the partner are perceived as "relationship crises," and one suppresses one's own opinions to maintain agreement. This may appear to be "consideration," but it is actually a loss of self that manifests as anger or emptiness in the long term.
In a state of high differentiation, one empathizes with a partner's emotions without being engulfed by them. Even when the partner is angry, one can calmly assess the situation. Disagreements can be accepted not as threats to the relationship but as "differences between two individuals." High differentiation is the foundation not of "coldness" but of "stable love."
In Bowen's theory, the level of differentiation is heavily influenced by experiences in the family of origin. People raised in overly enmeshed families tend toward fusion, while those raised in emotionally disconnected families tend toward excessive independence (which is actually avoidance). However, differentiation can be improved through conscious effort in adulthood.
Big Five Personality and Dependency Tendencies
Personality traits systematically influence the dependence-independence balance in relationships. Understanding which tendencies each trait is associated with enables objective recognition of one's own patterns.
People high in Neuroticism have the strongest dependency tendencies in relationships. They have intense abandonment anxiety and a constant need to confirm their partner's love. They feel anxious being alone and worry about "what the partner is doing" or "whether they're with someone else" during time apart. This tendency is strongly associated with anxious attachment.
People low in Extraversion (introverts) tend toward independence. They need time alone and prefer individual activities over social ones. This is not "avoidance" but a need for "recharging," though extraverted partners may misinterpret it as "not wanting to be together."
People high in Agreeableness tend to prioritize their partner's needs and struggle to set their own boundaries. They feel guilty saying "no," and consequently sacrifice their own autonomy. While this may be valued as "kindness," it leads to exhaustion from self-sacrifice and accumulated resentment in the long term.
People high in Conscientiousness emphasize "responsibility" in relationships as well. They tend to maintain relationships out of a sense of obligation to their partner, and the distinction between "wanting to be together" (spontaneous motivation) and "should be together" (sense of duty) can become blurred.
The Psychological Definition and Diagnostic Criteria of Codependency
Codependency was originally conceptualized as a pattern observed in partners of alcohol-dependent individuals, but is now used in broader contexts. Psychologically, codependency is a relational pattern characterized by "excessive responsibility for others' problems and emotions, and chronic neglect of one's own needs."
The main features of codependency include: (1) one's happiness is completely dependent on the partner's emotional state, (2) feeling that "I must solve" the partner's problems, (3) difficulty recognizing and expressing one's own needs and emotions, (4) inability to feel self-worth without the partner's approval, and (5) inability to leave an unhealthy relationship due to extreme fear of losing it. Related books can also be found at related books (Amazon).
What is important is distinguishing codependency from healthy interdependence. In healthy interdependence, both parties can recognize and express their own needs, respond to the partner's needs, but do not sacrifice themselves. In codependency, one (or both) loses their sense of self and becomes unable to function without the partner's presence.
Recovery from codependency involves: (1) practicing recognition of one's own needs and emotions, (2) setting boundaries starting with small "no's," (3) restoring relationships and activities outside the partnership, and (4) seeking professional support (counseling) when needed. From the perspective of Deci & Ryan's Self-Determination Theory, codependency is a state of chronic suppression of the autonomy need, and restoring autonomy is the core of recovery.
Methods for Setting Healthy Boundaries
Boundaries are clear lines defining "what I will tolerate and what I will not." Healthy boundaries are an indispensable tool for maintaining the balance between independence and interdependence.
Time boundaries: Clearly establish the right to secure time alone, time with friends, and work time. Set specific time frames such as "every Wednesday is my hobby time" or "I want to spend weekend mornings alone."
Emotional boundaries: Empathize with a partner's emotions without taking them on as "my responsibility." Maintain the recognition that "I understand you're sad, but resolving your sadness is not my job." This is not coldness but the practice of Bowen's "differentiation of self."
Physical boundaries: Clearly define personal space (one's own room, desk), privacy (smartphone, diary), and acceptable ranges of physical contact. For cohabiting couples, securing physical "space that is mine alone" is particularly important.
Values boundaries: Protect the right to hold opinions and values that differ from the partner's. Maintain a relationship where one can say "you may think that, but I think this." Not all values need to align - a relationship where differences are mutually respected is healthy.
The most important thing about setting boundaries is the recognition that "boundaries exist not to reject the other person but to protect the relationship." It is precisely because appropriate boundaries exist that intimacy within them feels safe. A relationship without boundaries may appear intimate on the surface, but actually carries the risk of both parties losing their sense of self.
The Scientific Necessity of "Time Alone"
"Time alone (solitude)" is qualitatively different from loneliness. Loneliness is unwanted social isolation that negatively affects physical and mental health. In contrast, voluntarily chosen time alone is an essential resource for psychological recovery and personal growth.
Research shows that moderate time alone serves the following psychological functions: (1) Emotion regulation: Processing emotional stimulation accumulated through social interaction and returning to equilibrium. (2) Self-reflection: Introspecting on one's emotions, thoughts, and values to deepen self-understanding. (3) Creativity restoration: Blocking external stimulation activates internal creative processes. (4) Confirmation of autonomy: Maintaining confidence that one can function without a partner.
For introverted people in particular, time alone is not a "luxury" but a "necessity." As the neuroscientific basis of introversion, introverted people have higher arousal levels in response to social stimulation, consuming more energy from the same amount of social interaction than extraverted people. Therefore, they need more time alone for recovery.
What is important for couples is not interpreting a partner's need for "time alone" as personal rejection. "I want to be alone" does not mean "I don't want to be with you" but rather "I want to recharge so I can be with you in a better state." When this understanding is shared, time alone becomes not a threat to the relationship but an investment in improving its quality.
Research on Couples' Optimal "Time Together"
Does an "optimal amount" of time for couples to spend together exist? Research findings on this question do not provide a simple answer, because the optimal amount varies greatly depending on individual personality traits, relationship stage, and life circumstances.
However, several general findings exist. First, "quality" predicts relationship satisfaction better than "quantity." Even spending long hours together, if that time is spent watching TV in silence, its contribution to relationship satisfaction is limited. Even short periods of "quality time" involving meaningful conversation or joint activities are more effective.
Second, it is important that "time together" includes both "joint activities" and "parallel activities." Joint activities (cooking together, walking, conversing) involve direct interaction and enhance intimacy. Parallel activities (doing separate things in the same room) provide the reassurance of "being together without interfering" and correspond to Bowlby's secure base concept.
Third, the optimal time allocation changes with the relationship stage. In early dating, the desire to "be together" is strong (the limerence phase), and spending much time together is natural. However, as the relationship enters a stable phase, the need to restore individual activities and social networks arises. When a partner feels anxious during this transition that "we're not spending as much time together as before," it is important to understand together that this is not a relationship problem but a natural developmental stage.
Ultimately, the optimal balance is something each couple finds through dialogue. Frank conversations like "how much time alone do you need?" and "what do you want to do when we're together?" lead to discovering a balance comfortable for both. As Deci & Ryan's Self-Determination Theory shows, the key to relationship satisfaction is that this balance is felt as a "voluntary choice."
A Dialogue Guide for Finding the Balance Between Independence and Interdependence
The optimal balance differs for each couple and also changes with the relationship stage and life circumstances. Regular dialogue is essential for finding and maintaining this balance. Below is a concrete list of questions for dialogue.
Questions about autonomy: "Are you getting enough time alone right now?" "Do you have enough time for your hobbies and friendships?" "Do you ever feel you're losing yourself in our relationship?" These questions check the fulfillment of the autonomy need in Deci & Ryan's Self-Determination Theory.
Questions about relatedness: "Are you satisfied with the quality of our time together?" "Is there something you'd like to do more together?" "Do you ever feel lonely toward me?" "Is there a part of our relationship you'd like to deepen?" These check the fulfillment of the relatedness need.
Questions about boundaries: "Is there anything I do that you feel crosses your boundaries?" "Conversely, do you feel I'm too distant?" According to Bowen's differentiation theory, these questions function to check both parties' differentiation levels and prevent fusion or disconnection. This dialogue should be conducted preventively on a regular basis (about once a month), not only after problems arise. As Bowlby's secure base concept shows, a safe relationship is not "a relationship without problems" but "a relationship where problems can be discussed safely."