I remember a story of a woman with a perfect memory (some gene mutation), the problem was that she remembered EVERY conflict she ever had with anyone. She was alone, because once she had an issue with anyone she was not able to forgive them, because in her memory it was always as crisp (and as painful) as if it happened minutes ago.

I am not an expert, but I feel like the brain might miss details of traumatic memories on purpose, to make it easier to deal with.