The Part of You That Cannot Leave: An IFS View of Codependent Relationships

Why do people remain in relationships that repeatedly hurt them? From an Internal Family Systems (IFS) perspective, the answer is often that protective parts associate leaving with danger, guilt, abandonment or failure. Understanding those parts can reduce shame and create enough inner safety for clearer, healthier choices.

“Why don’t you just leave?”

It is one of the most common questions people ask themselves when they remain in painful or toxic relationships. Friends and family may ask it too. From the outside, the repeated patterns, broken promises and lack of lasting change can make the answer appear obvious. Yet leaving is rarely as simple as recognising that a relationship is harmful.

Someone may understand that something is very wrong and still feel unable to act. One part may be exhausted and desperate for freedom, while another remains frightened, hopeful or burdened by guilt. This is one reason why awareness does not automatically create action. Parts work, commonly known as IFS, offers a compassionate way to understand this conflict. Instead of viewing the person as weak or irrational, it asks: what is the part that cannot leave trying to protect?

The protective part behind staying

IFS describes the mind as containing different “parts”: learned emotional positions and protective patterns, not separate personalities. In a codependent relationship, one part may take responsibility for keeping everything together. It monitors the other person’s moods, avoids confrontation, excuses harmful behaviour and keeps trying to repair what is repeatedly broken.

This part may believe leaving would be selfish or cruel, or that the other person could not cope without them. It may fear collapse, retaliation or rejection. Another part may remain attached to how the relationship once felt, especially the intensity of the honeymoon period. It is not necessarily loyal to the relationship as it is now, but to the relationship it hopes will return. These parts are trying to prevent something they believe would be even more painful.

When responsibility begins early

Many codependent patterns begin long before the adult relationship. A child who grows up around unpredictability may learn to monitor the emotional environment closely. They become sensitive and hypervigilant to tone, expression and changes in mood. They may try to keep the peace, comfort a parent or avoid becoming a burden.

Being useful, helpful, quiet or compliant can create a sense of safety. At the same time, the child’s own needs may be pushed aside because there seems to be no room for them. Over time, this can become an unconscious rule: other people’s wellbeing must come before mine. As an adult, the pattern may feel like loyalty, commitment or love. Beneath it, however, may be an old fear that something terrible will happen if they stop holding everything together.

The conflict between parts

This explains why insight does not always lead directly to action. One part may see the contempt, neglect or manipulation clearly and want distance. Another part may respond with fear: what if leaving causes loneliness, financial hardship or danger? What if being alone seems to confirm the belief that they were never worthy of love?

A guilty part may argue that relationships require sacrifice, or that leaving means abandoning someone who needs them. A hopeful part may treat every apology or brief improvement as proof that the relationship can still be saved if they work or love a little harder. Several parts are pulling in different directions, each trying to protect the person from a different kind of pain. What feels like indecision may therefore be an intense internal struggle.

Why pressure often fails

Telling someone that they simply have to leave can intensify this conflict. When protective parts feel judged or threatened, they may defend the relationship, minimise the harm or withdraw from people who challenge them, including therapists. The same can happen internally when a person calls themselves weak or stupid. Shame adds another layer of distress and can make action even harder.

IFS takes a more curious approach. What does this part believe would happen if the relationship ended? Whose wellbeing does it feel responsible for? What did it learn about love, responsibility and abandonment? Listening does not mean allowing that part to control every decision. It means understanding why it exists so that fear is no longer the only voice in the room.

From self-abandonment to self-leadership

The aim is neither to force immediate change nor to remain because a frightened part demands it. Self-leadership means approaching the situation from a steadier internal position. It allows fear to be heard without automatically allowing it to determine the future.

This may involve setting a boundary and observing what follows. It may mean seeking support, developing more secure attachment in adulthood, or accepting that a relationship’s potential is not the same as its reality. Sometimes both partners are willing to work together. In other cases, the person recognises that they have been sustaining the relationship alone.

Compassion for the part that stayed does not require continued submission to the pattern. People often remain in painful situations because some part of them believes staying is necessary for safety, belonging or moral worth. Change can begin when that part is neither shamed nor placed in charge. It can be heard, understood and helped to see that letting go may not be abandonment. It may be the beginning of returning to oneself.

Safety note: If a relationship involves violence, coercive control, stalking, threats or immediate danger, leaving may require careful safety planning. Consider contacting a specialist domestic-abuse service or local emergency support rather than confronting the situation alone.

Reflective question

What does the part of you that keeps holding on believe would happen if you finally let go?

Frequently asked questions

What does IFS mean by a “part”?

A part is a learned emotional position or protective pattern. It is not a separate personality or a diagnosis. Parts can carry fear, guilt, hope or responsibility and may react according to what once helped the person feel safe.

Why can leaving a harmful relationship feel so difficult?

Fear, guilt, attachment, hope and practical risks can pull in different directions. A person may know the relationship is harmful while also fearing loneliness, retaliation, financial insecurity or the loss of the relationship they hoped it would become. This conflict is not evidence of weakness.

Can understanding a protective part help me leave?

Understanding can reduce shame and make choices clearer, but it is not a substitute for practical support or safety planning. Where there is abuse or danger, specialist professional support may be essential.

If this article resonates and you recognise an internal struggle between knowing that something must change and feeling unable to act, I offer a free initial consultation. Together, we can explore the patterns keeping you stuck and consider a clearer, more personally authentic way forward.

About the author

Dr Nicholas Jenner is a therapist and coach with more than 20 years’ experience. He specialises in codependency, attachment and relationship patterns, using approaches including Internal Family Systems (IFS) to help people turn insight into practical change. He offers online therapy and therapeutic groups.