Mine seems to love to dwell happily in the past. Always talking of memories we share. Only the "feelings" are re-written. Even through the recent memories, he "hasn't loved me for years".
It is interesting when he does spew, details that I have long forgotten, incidences that I thought long over are brought up again and again. Like a record needle stuck in a grove, repeat, repeat.
Do you think that is how they finally feel justified in walking away? The song in their head is just one long repeating record of one or two negative things?
As for re-writing the recent past - shoot - mine can't remember what he told me yesterday, like a fish who can't remember one end of the fish tank from another.