Why is it that only the bad stuff remains in the mind?
Think about it in terms of survival, don't think that your wife or you or anyone else is really so different in this area.
It's a survival mechanism, the brain associates bad things and bad feelings with things that can harm, hurt or kill you. What's the idea behind this? If bad things can kill or harm you, our brains are setup to remember these things and remind us to protect us.
If you miss out on remembering some good things, that's not going to kill you.
But forgetting about something that can harm or kill you, that's deadly. You have a built in auto-pilot mechanism for self-preservation and to also protect your children since they will most likely outlive you.
It's actually a good thing, without this survival mechanism, you would be dead.
