What Forgiveness Actually Does to Painful Memories

We all know the phrase forgive and forget. But does forgiveness really help us forget? A recent study has verified something that most of us know from experience—it does not. Think about a time someone betrayed you, lied to you, broke a promise, or let you down emotionally. That moment probably stayed with you for a very long time. Even when you want to move on, the memory can still carry pain, anger, or sadness.

So if not forgetting, what exactly does forgiveness do?

Research suggests that forgiveness does not erase the memory of what happened. Instead, it may change the meaning of the memory so that it becomes less painful. In other words, we do not forgive and forget as much as we forgive and update (the memory).

Forgiveness Can Change the Emotional Meaning of a Memory

The findings suggest that when we forgive someone, our brain may “update” the emotional meaning of the painful event. In the study, people were shown upsetting images that had been deliberately chosen for them by other people. Later, they learned that one of the people who had caused the distress had a reason for what they did, understood the harm they caused, felt remorse, and apologized. The participants were then asked to forgive them.

The next day, the participants saw the upsetting images again. The images linked to the person they had forgiven caused less distress than images linked to someone they had not forgiven. The memory was still there, but it had lost some of its emotional force. Brain scans offered a clue as to why. Areas involved in memory seemed to work together with areas involved in understanding another person’s perspective. The researchers concluded that forgiveness may add new emotional information to the old memory, making it less sharp and painful.

But forgiveness only works this way when it's genuine. It isn't something we can do on command by simply deciding to truly forgive. Real forgiveness usually requires something from the person who caused the harm. Another recent study helps explain what that is. It looked at situations in couples where one partner had violated the other’s trust or expectations by lying, being unfaithful, breaking promises, acting inconsiderately, or being overly critical. But here, the researchers did not focus mainly on forgiveness. They focused on unforgiveness.

Unforgiveness is not just the absence of forgiveness. It can include ongoing hurt, resentment, anger, rumination, and a changed view of the other person. When someone seriously hurts us, our reactions include what that means about them and about the relationship. That's why some injuries feel so destabilizing. The person may now seem different to us, and the relationship may feel less safe.

The study found that people were less unforgiving when their partner listened, cared, validated their feelings, and stayed emotionally present after the hurtful event. They were much more unforgiving when their partner seemed dismissive, detached, insensitive, or unwilling to acknowledge their pain. In other words, forgiveness often depends on repair.

When we have been deeply hurt, what helps us move toward real forgiveness is not just hearing “I’m sorry.” It is feeling that the other person truly understands the impact of what they did. That usually means they listen without immediately becoming defensive, acknowledge the pain they caused, validate our feelings, stay emotionally present, and make a real effort to repair the damage. Those actions help rebuild trust, and they also make authentic forgiveness more possible. And when forgiveness becomes more authentic, the memory of the injury may soften.

The Value of Unforgiveness

Forgiveness is often treated as if it is always the healthiest response, while unforgiveness is treated as a sign of bitterness or immaturity. But that is too simple. Sometimes unforgiveness is a signal that tells us that the harm was serious, that accountability has not happened, that the hurtful behavior is still continuing, or that we still do not feel emotionally safe. In those situations, unforgiveness can be protective. Of course, staying stuck in anger and resentment for a long time can be painful. It can keep the injury emotionally alive. But that does not mean forgiveness should be rushed. If forgiveness is offered before it feels real, the pain often remains.

Therefore, instead of asking yourself, Should I forgive? ask, What do I need from the other person for forgiveness to feel genuine? What kind of repair would help me feel safer, more understood, and more able to let the memory soften? Repairing the relationship is key to healing and to forgiveness.

A version of this post also appears in my newsletter "The Psychology Lab."

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