Why It's So Hard to End a Long-Term Relationship | Science-Backed Reasons (2026)

The complexities of ending a long-term relationship are multifaceted, and it's not just practical concerns or emotional attachments that make it challenging. According to Sian Khuman, a consultant psychologist and couples therapist, there are scientific underpinnings to this dilemma. Khuman emphasizes the importance of understanding the psychological and brain-based processes that hinder the decision to end a relationship. By recognizing these barriers, individuals can gain awareness and explore their motivations, which is crucial for making informed choices. This self-reflection is a powerful tool for personal growth and can help individuals navigate the intricate web of emotions and commitments that come with long-term relationships.

One of the key factors is the 'sunk cost fallacy,' where individuals justify staying in a relationship due to the significant investment of time, energy, and resources. As Carly Dober, a psychologist and policy coordinator, explains, the more one invests, the more attached they become. This attachment can lead to a fear of losing what has been gained, even if the present circumstances are less than ideal. To combat this, Dober suggests a simple yet effective approach: questioning the value of the relationship. By evaluating what the relationship truly offers, individuals can make more rational decisions, understanding that it's acceptable to change one's mind and that not all relationships are meant to be permanent.

The concept of 'couple identity' is another critical aspect. Over time, partners become intertwined with each other's identities, and leaving one feels like losing a part of oneself. Dober highlights the enmeshment of lives and the fear of losing everything when considering a break-up. Khuman adds that this includes shared routines, hobbies, and future plans, all of which contribute to the complexity of ending a relationship. The fear of losing these shared aspects can be a powerful motivator to stay, even when the relationship may not be fulfilling.

Adult attachment is another psychological factor at play. Khuman explains that long-term relationships develop a primary attachment into an adult attachment, which is driven by the brain's desire for safety, security, and emotional fulfillment. Ending such an attachment can trigger fear and anxiety, as the brain perceives the loss as a threat to these fundamental needs. Dober supports this, citing research that suggests physical pain can be associated with feelings of rejection or ostracization. The fear of being alone is a potent force, and overcoming it requires understanding that the brain's response is a natural reaction to a perceived threat.

Anticipated grief is another barrier that individuals may face. Khuman suggests that the fear of the unknown pain associated with a break-up can be more intimidating than the actual experience. This anticipated grief can lead to avoidance, where individuals stay in unhealthy relationships, fearing the emotional turmoil of a potential breakup. To address this, Khuman recommends journaling, seeking support from trusted individuals, and evidence-based testing of one's coping mechanisms. By recognizing the potential for coping and the possibility of reduced grief over time, individuals can make more rational decisions about their relationships.

In conclusion, the scientific reasons behind the difficulty of ending a long-term relationship are multifaceted and deeply rooted in our psychological and emotional makeup. By understanding these factors, individuals can gain the awareness and tools to navigate the complexities of relationships, make informed decisions, and ultimately, find the strength to move forward when necessary. It is through this self-awareness that personal growth and healthier relationship choices can be achieved.

Why It's So Hard to End a Long-Term Relationship | Science-Backed Reasons (2026)

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