In the first hours after a bad decision, regret arrives fast and sharp. You made the avoidable mistake, said the wrong thing, took the wrong path. That texture is specific: the thing that went wrong is clear, the moment it happened is clear, and the possibility of having done otherwise is vivid. Ask someone about their most significant regrets five or ten years later, and something different tends to come up instead.
The newer regrets are almost never about what happened. They are about what didn’t.
Research in psychology has mapped this shift with some precision. Psychologists Thomas Gilovich of Cornell University and Victoria Husted Medvec first described the pattern in a 1994 study published in the Journal of Personality and Social Psychology. Through telephone surveys, written questionnaires, and face-to-face interviews, they found that people’s biggest regrets tend to involve things they have failed to do in their lives — not things they did and wish they hadn’t. This conflicts with a prior body of research on counterfactual thinking, which found that people regret actions more than inactions in the short term.
The 1994 paper reconciled those findings by demonstrating that regret follows a systematic time course: actions cause more pain in the short term, but inactions are regretted more in the long run.
The numbers from their study are specific. In one experiment asking participants to recall their single most regrettable action and inaction from two different time periods, they found no significant difference in the short term. But when asked to identify the greater regret from their entire lives, 84 percent of participants pointed to something they hadn’t done.
Why the asymmetry? Action regrets tend to resolve, or at least recede. When something goes wrong because of a choice you made, there are mechanisms for processing it: explanation, acceptance, the gradual work of having moved past it. A mistake can be examined, placed in context, and eventually integrated into a narrative where you understand why it happened and who you were at the time. Its edges get worn down.
Inaction regrets work differently. The counterfactual stays open. There is no resolution because there was no event. The version of you who took the chance, learned the skill, had the conversation, or pursued the thing you wanted remains entirely hypothetical, and hypothetical selves don’t age. The opportunity that was never taken doesn’t shrink with time the way a mistake does. It stays available for revisiting, still lit from the inside, still carrying the full weight of what might have been.
Gilovich, speaking about related research published in 2018, described the specific category of inaction that proves most persistent. “When we evaluate our lives, we think about whether we’re heading toward our ideal selves, becoming the person we’d like to be,” he told Cornell Chronicle. “Those are the regrets that are going to stick with you, because they are what you look at through the windshield of life.”
The distinction he draws is between regrets about failing to live up to an ought self, what you were supposed to do, and regrets about failing to live up to an ideal self, the person you hoped to become. The ought regrets tend to be more concrete, more resolvable, and more likely to diminish. The ideal-self regrets tend to be vaguer, more open-ended, and therefore harder to close. “The failure to be your ideal self is usually an inaction,” Gilovich said. “It’s ‘I frittered away my time and never got around to teaching myself to code or play a musical instrument.'”
It is worth noting that the original 1994 findings on the temporal pattern of regret have shown somewhat variable results in subsequent replications, with some studies finding weaker or more qualified versions of the effect. The pattern is influential and has been widely cited, but the research should be read as describing a broad tendency rather than a universal law. Individual differences, cultural context, and the specific type of decision all affect how regret develops over time.
What the research does consistently find, across iterations, is that long-term regret concentrates disproportionately on inaction. The specific shape of that regret varies. What doesn’t vary much is its direction: looking back, what troubles people most is generally not what they did and shouldn’t have. It’s what they didn’t do and wish they had.
“In the short term, people regret their actions more than inactions,” Gilovich has summarized. “But in the long term, the inaction regrets stick around longer.” The mechanisms behind that are complex enough that researchers continue to study them. The practical observation, though, is simple enough to hold.
If regret is something that sits heavily for you right now, speaking with a therapist is worth more than any psychology study can offer.
