A fine, decent, hardworking man who's trying to excel at work and at family life is also competing with the shadows of his wife's wild, condescending ex-lover from almost a decade ago through her journal. The journal is detailed you'd begin to wonder if the events happened five minutes ago, or from a real perspective, exaggerated.
A bit of truth in the general plot: people miss those they had great sex with but down to those fine details after all those years and life's events, nah! The average Copper will lose it after reading the journal but this particular Copper tried to step up: a few men will do that.