Regret comes quickly and sharply in the first hours after a bad decision. You made an avoidable mistake, you said the wrong thing, you went the wrong way. This texture is specific: what went wrong is clear, the moment it happened is clear, and the possibility of it being otherwise is clear. Ask someone five or ten years down the line about their most significant regret, and they tend to come up with something different instead.
The new regrets are hardly related to what happened. They are about the non-existent.
Research in psychology has shown this change with some precision. Cornell University psychologists Thomas Gilovich and Victoria Husted Medvec first described the pattern in a 1994 study published in the Journal of Personality and Social Psychology. Through phone surveys, written surveys, and face-to-face interviews, they found that people’s biggest regrets were about the things they couldn’t do in their lives—not the things they did and didn’t want to do. This contrasts with a body of previous research on counterfactual thinking that has found that people are more likely to regret their actions than inaction in the short term.
1994 paper reconciled these findings by demonstrating that regret follows a systematic time course: actions lead to more pain in the short term, but inaction leads to more regret in the long term.
The numbers from their research are concrete. In an experiment that asked participants to recall their single most regrettable actions and inactions over two different time periods, they found no significant difference in the short term. But when asked to identify their biggest life regret, 84 percent of participants pointed to something they didn’t do.
Why asymmetry? Action tends to resolve or at least reverse regrets. If something goes wrong because of a choice you made, there are mechanisms to process it: explanation, acceptance, gradual work to move past it. A mistake can be explored, placed in context, and ultimately integrated into a story where you understand why it happened and who you were at the time. Its edges are frayed.
Inaction regrets work differently. The opposite fact remains open. Since there is no event, there is no decision. The version of you that takes a chance, learns a skill, has a conversation, or goes after what you want remains entirely hypothetical, and hypothetical selves don’t age. An opportunity that is never missed does not shrink with time like a mistake. It remains available for revision, still illuminated from within, still carrying the full weight of what might have been.
Citing related research published in 2018, Gilovich described a specific category of inactivity that proved to be the most durable. “When we evaluate our lives, we think that we are moving towards our ideal self, becoming the person we want to be,” he said. Cornell Chronicle. “These are the regrets that stay with you because they are the things you look through the windshield of life.”
The distinction he draws is between feeling sorry for not living up to the self you need, what you should be doing, and regretting not living up to an ideal self, the person you want to be. Necessary regrets are more specific, more solvable, and more likely to be mitigated. Ideal self regrets are more vague, more open, and therefore more difficult to close. “Failure to be your ideal self is generally inaction,” Gilovich said. “I wasted my time and never taught myself to code or play an instrument.”
It should be noted that the original 1994 findings on the temporal pattern of sedation have shown somewhat variable results in subsequent replications, with some studies finding weaker or better versions of the effect. The pattern is impressive and widely cited, but the study should be read as illustrating a broad trend 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 consistently reiterates is that long-term regret is disproportionately focused on inaction. The specific form of that regret varies. What hasn’t changed much is its direction: what bothers people the most in retrospect is generally not what they did or shouldn’t have done. It’s what they don’t do and what they wish for.
“In the short term, people regret their actions more than inaction,” Gilovich concluded. “But in the long run, inaction regrets linger longer.” The mechanisms behind this are so complex that researchers continue to study them. However, it is simple enough to maintain practical observation.
If regret is something that is very important to you right now, talking to a therapist is worth more than any psychology research can suggest.
