We invest years in a relationship—does that mean we have to stay, even if we’re no longer happy? Should we hold on to people just because we once loved them, even if they no longer bring us joy?
One of the most common relationship mistakes is staying in a situation simply because of the time and effort we’ve already put in. This is known as the Sunk Cost Fallacy—the belief that past investments justify continuing something, even when it’s no longer serving us. Love, sacrifices, time, and energy can make us feel like we must keep going, even when deep down, we know it’s time to let go.
Turkish writer Mine Urgan captures this dilemma perfectly:
“If you cut open a watermelon and find that it’s tasteless, will you force yourself to eat it? After hearing this sentence, I decided to quit whatever I started as soon as I stopped enjoying it—whether it be a book or a person.”
What Is the Sunk Cost Fallacy?
A concept widely used in economics and psychology, the sunk cost fallacy refers to the tendency to persist with something simply because of the resources already invested—whether it’s time, money, or effort.
We see this in everyday life:
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Watching a boring movie just because we’ve already started it.
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Sticking with an expensive course that isn’t helpful.
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Continuing a failing business project because of the work already put in.
But in romantic relationships, this fallacy becomes far more emotionally complex and damaging.
How Does the Sunk Cost Fallacy Manifest in Relationships?
People in long-term relationships or marriages often feel pressured to stay because of their past commitment, rather than the present quality of the relationship. If these thoughts sound familiar, you might be experiencing the sunk cost fallacy:
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“We’ve been together for so many years—leaving now would make it all a waste.”
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“I know everything about them; how could I start over with someone new?”
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“I’ve sacrificed so much; does it really make sense to leave now?”
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“I stood by them in their hardest times—I deserve to enjoy the good times too.”
This mindset suggests that the relationship is being maintained out of fear of wasted effort, rather than genuine happiness and fulfillment.
Yet, emotional investments differ from financial ones. When a stock loses value, a smart investor sells it instead of clinging to a bad investment. But when it comes to relationships, we struggle to apply the same logic—often at the expense of our own well-being.
Why Is It So Hard to Let Go?
Several psychological and cultural factors make it difficult to leave an unfulfilling relationship:
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Fear of Loss & Uncertainty
The human brain perceives losses more intensely than gains. Even if leaving could lead to a better future, the immediate pain of loss feels overwhelming, making staying seem like the safer choice. -
Social & Cultural Pressure
In collectivist cultures, such as Turkey, society’s opinions weigh heavily on personal decisions. There’s a strong emphasis on endurance in relationships, and phrases like “You’ve lasted this long—why quit now?” create guilt around leaving. Divorce and breakups still carry stigma, making people feel obligated to stay. -
Romanticized Sacrifice
Many cultures idealize self-sacrifice in love, reinforcing beliefs like:-
“Love requires endurance.”
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“Every relationship has struggles—just be patient.”
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“A good partner never gives up.”
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While love does require commitment, it should not come at the cost of personal well-being. As Turkish psychologist Mehmet Zihni Sungur puts it:
“The effort to become ‘us’ should not come at the cost of losing yourself.”
Who Is More Likely to Fall into This Trap?
Our attachment styles and personality traits play a significant role in whether we hold on to relationships out of fear rather than choice.
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Anxious Attachment
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These individuals seek constant reassurance and fear abandonment.
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They might think: “I sacrificed so much—I can’t walk away now.”
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They prioritize their partner’s needs over their own, even to their own detriment.
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Avoidant Attachment
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While they fear emotional closeness, they also resist change.
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They may stay in an unfulfilling relationship simply because “starting over is too much effort.”
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Secure Attachment
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These individuals approach relationships with balance and clarity.
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If a relationship is no longer healthy, they recognize the need for change and act accordingly.
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They can say: “This relationship is no longer good for either of us.”
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Perfectionists
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They see ending a relationship as failure and may think: “If I walk away, it means I wasn’t good enough.”
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People with Low Self-Esteem
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They might believe: “No one else will want me—I should just stay.”
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Fear of being alone can make them settle for less than they deserve.
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Self-Sacrificing Personalities
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They prioritize others over themselves, leading to thoughts like: “I’ve done so much for them—leaving would be selfish.”
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How Can We Break Free from the Sunk Cost Fallacy?
The key to escaping this mindset is shifting focus from the past to the present and future. Ask yourself:
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Does this relationship make me happy, or am I just staying out of habit?
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Is my partner responsive to my needs?
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Will staying bring me happiness, or just more pain in the long run?
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Am I staying out of love, or just because I don’t want to “waste” the years I’ve invested?
If the answers suggest there’s still potential for improvement, putting in effort can be worthwhile. However, if the relationship is causing consistent harm and unhappiness, letting go is the healthiest option.
Just like we don’t have to finish a bad book, we don’t have to stay in a relationship that no longer serves us. Every book—and every relationship—has an ending. What truly matters is how the story unfolds for you.
Final Thoughts: The Courage to Let Go
Breaking free from the Sunk Cost Fallacy is essential for a healthy and fulfilling life. Sometimes, the greatest act of courage is not holding on—but knowing when to let go.