You've said it well: clinging to the bad experiences is a killer.
Sadly, learning how to "let go" seems contrary to our intuition and we tell ourselves that it just can't be done. We tell ourselves that the resentments and the hatreds are just too damn deep.
We don't listen to the only ones who really care because they tell us to simply "let it go!" What do they know anyway?
But the solution, the freedom, the restoration of sanity is truly that simple: Let It Go. When you let it go their power over your life ends.