Single Bolster

Why do humans do this? After one has been in a marriage or part of a religion or team or religion or something
or like an ex smoker or Christian or plygamist – criticizes it so harshly like as if they suffered every single day of it – when clearly it just ended badly and effected their ability to view the past in a balanced way. Why does the human mind need to invalidate the past to bolster their present situation. It seems suspect and automatic behavior to me.
A woman or man who was happily married then says “Oh I always hated you” etc. Your thoughts?
And I was not just talking about relationships, I also meant careers, obsessions, practices, your old job,your old religious convictions etc. Things we now say – Oh that was bad or crazy or they used me .
That’s true, but oftentimes you see it in the opposite. (There is no better parent than someone with no kids).
But on the other hand, there is no one more moral than a reformed criminal.
Human nature?
Exercise Videos- Single-Side Rotation Crunch on Bolster