"dwelling in the past won't do you good."
but 
forgetting the past isn't better;
and
absolutely not the best...

naught

Untitled

I have realized that the past and future are real illusions, that they exist in the present, which is what there is and all there is.
-Alan Watts

It's good to try to put the past into perspective. Sometimes you need a good therapist to help you do that !