We often believe that we judge our relationships based on a fair average of every day we spent together. Psychology suggests otherwise. According to the peak-end rule, our memory ignores the duration of an experience and focuses almost entirely on two specific points: the most intense moment (the peak) and the final moments (the end).
This mental shortcut explains why a relationship that was mostly happy but ended in a bitter fight is often remembered as a failure, while a turbulent romance with a few ecstatic highs and a gentle parting stays in our memory as a great love. Understanding this rule can help us in reclaiming realistic expectations in relationships and reshaping how we view our past and how we nurture our connections today.
Your brain is not a video camera
The peak-end rule was first identified by the Nobel Prize-winning psychologist Daniel Kahneman. In a famous 1993 study, he showed that people judged a painful experience (keeping a hand in ice water) as less bad if a slightly warmer period was added to the end, even though the total duration of pain was longer.
The brain does not record a continuous film of our lives. It takes snapshots. When we look back, we do not calculate an average of satisfaction across thousands of breakfast conversations. Instead, we retrieve the emotional highlights – the “peaks” – and the conclusion.
In love, this means a ten-year marriage filled with quiet contentment can be mentally overwritten by a few months of painful divorce proceedings. The “end” dominates the story. Conversely, a short, chaotic fling might be remembered fondly if it included one spectacular trip and ended with a mutual, tearful goodbye.
Peaks define the story
The “peak” is the most emotionally intense moment of an experience, whether positive or negative. These moments carry disproportionate weight in our autobiography.
If you want to strengthen a current bond, you do not necessarily need to improve every single day by 1%. It is often more effective to create a few positive peaks. A surprise weekend trip, a heartfelt letter, or a moment of deep support during a crisis can anchor the memory of the relationship for years.
However, negative peaks work the same way. A single devastating argument where sarcasm can undermine relationship warmth can color the memory of an otherwise peaceful year. This bias explains why some people stay in toxic relationships: the intermittent “highs” (make-up sex, grand gestures of apology) are so intense that they outweigh the low-level misery of the daily routine.
The ending writes the headline
The “end” is the second pillar of this rule. The final phase of an interaction or a relationship determines how we file that memory away.
This applies to small interactions as well as big ones. A dinner date that is wonderful for two hours but ends with a cold argument in the car will likely be remembered as a bad night. A difficult conversation that ends with a hug and a plan will be remembered as a moment of growth.
For past relationships, the peak-end rule creates a specific distortion known as duration neglect. We tend to forget how long a state lasted. We might discount five years of happiness because the final two months were angry. Recognizing this bias can be a form of healing. It allows us to acknowledge that a relationship was good and valuable, even if it had a bad ending.
What you can do about it
You can use the peak-end rule to improve your relationships and your peace of mind.
Curate positive peaks. Do not rely on routine alone. Plan occasional experiences that stand out. Novelty and intensity create the “bookmarks” that define your shared history. You can use practical strategies to leverage the rule by planning small, varied adventures.
Manage the endings. In daily life, try to end phone calls, dates, and even arguments on a positive or at least calm note. You can use the five-second pause to prevent relationship conflicts and ensure the last thing you say isn’t something you regret.
Reframe the past. If you are haunted by a bad breakup, remind yourself of the peak-end bias. The messy ending is just one data point, not the whole truth. Try to deliberately recall the positive peaks – the laughter, the support, the friendship – to create a more balanced view of the time you shared.
Sources & related information
Forbes – A Psychologist Explains The Peak-End Rule Of Love – 2024
Psychologist Mark Travers explains how Kahneman’s theory applies to romantic memory, noting that we judge relationships by their most intense highs or lows and their conclusion, often ignoring the duration of positive stability.
Psychology Today – 3 Ways to Beat the ‘Peak-End Rule’ in Your Relationship – 2025
This article suggests practical strategies to leverage the rule, such as diversifying positive shared experiences to create a “portfolio of peaks” rather than relying on rare grand gestures.
Psychological Science – When More Pain Is Preferred to Less: Adding a Better End – 1993
The original study by Daniel Kahneman and colleagues that established the peak-end rule, demonstrating that people prefer a longer painful episode if it ends with a slightly lower level of pain.
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