Why do you remember a relationship differently once it’s over?
While it was happening, it was just a relationship — good weeks, flat weeks, one bad fight in March that got resolved and mostly forgotten, a lot of ordinary Tuesdays that were not about anything in particular. Then it ends, and within a few months the whole thing has a verdict attached to it. It was good and you lost it, or it was bad and you should have left sooner. Rarely does the verdict sound like "it was mixed, the way most long stretches of time are." Memory does not seem to allow relationships to stay mixed once they are over.
The ending goes looking for a story that explains it
A relationship that is still going does not need a theory of itself. It is just happening, one week folding into the next, with no requirement that any of it add up to something. The moment it ends, that changes — you now have an outcome, and memory hates an outcome with no explanation attached to it. So it goes back through everything it has, quietly reorganizing the material into a story that accounts for how things turned out. The bad nights get promoted, because they explain the ending. The good ones get filed as exceptions, because they complicate it. None of this is done on purpose. It is just what a mind does when it is handed a result and asked, implicitly, to justify it.
Two different rewrites, and you might do both
There are two common directions this goes, and it is not unusual to cycle through both in the same year. One version idealizes: the relationship becomes, in hindsight, better than it was lived — a highlight reel of good years, with the reasons it ended fading into vague, unspecific language. The other version does the opposite, building a case for the breakup by remembering mostly the friction, so that leaving feels justified rather than sad. Neither version is dishonest, exactly. Both are real edits of a real relationship. But neither one is what a person living through any single week of it would have written down at the time, because at the time there was no case to build yet.
A whole relationship compresses the same way a single day does
This is the same flattening that happens to a single hard day, just at a much larger scale. A day that had one bad hour in it gets remembered as "a bad day," even though most of it was unremarkable. A relationship that had one bad year in it gets remembered as "the bad years," even if most weeks inside them looked like any other week from before. The unit gets larger — a day instead of an hour, years instead of a day — but the mechanism is the same: a strong enough moment or stretch takes over the memory of everything around it, and the surrounding ordinariness disappears into whatever tone the strongest moment set.
What the record from the time actually held
If you had written a line most days while it was happening — not about the relationship as a subject, just what you were doing, who you were with, what an evening was actually like — none of those lines would know how the story ends. A Tuesday logged as "cooked together, argued about nothing, fine by the time we went to bed" is not evidence for either rewrite. It is just what a Tuesday was. Read back a stretch of these and the relationship stops being a verdict and goes back to being what it always was while it was happening: some good stretches, some flat ones, an argument that got resolved and one that maybe did not, none of it arranged toward an ending, because none of it was written with the ending in mind.
You do not have to pick a side to keep this
None of this is an argument that the relationship was actually good, or actually bad, or that either rewrite is the wrong way to feel about it now. People are allowed to need a story that makes an ending easier to carry, and both the idealized version and the harsher one can do that work honestly. The record is not there to correct your feelings or settle which version is true. It is just there in case you ever want to check a specific memory against what you actually wrote down before you knew how things would turn out — not to relitigate anything, just to have one line that was not written with a verdict already in mind.
Where TimeMap fits
TimeMap logs a short line at a time — what you were doing, who it was with, a category colour — with no field asking how the relationship is going or whether today counts as a good sign. It is not built to track a relationship as a subject any more than it tracks anything else as a subject; it just keeps whatever ordinary evening you wrote down, dated, sitting there the way you left it. Read back a few months later, with or without the relationship still going, and the entries have not been edited by anything that happened since.
The version you settle on once it is over will probably still be one of the two rewrites, and that is fine — most people need one to move on. But somewhere underneath it, if you wrote it down at the time, is a stretch of ordinary Tuesdays that never got the memo about how the story was supposed to end.