Dowser
must have been a dreadful shock - my sympathy is with you all.
I will try to explain this as best I can (because if I think about it too much even I think I sound crackers...)
My ex was a vile, nasty piece of work. Truly awful and it took me from NYE until Burns Night to actually leave him. He proposed to me once he finished beating me up. I said yes. If I'd said no, he probably would have killed me.
Leaving was hard because I felt that if I had been kinder/nastier/worked less/worked more/danced naked around Morrisons he wouldn't be so bad. It was all my fault...it wasn't. He was an appalling human.
BUT if I saw him now I would say "Thank you. You're a massive c**t, but thank you. What you put me through was designed to break me and it didn't. It made me stronger. Your abuse made me leave and if you hadn't been so vile I would have led a nondescript life. My life is all the better for having gone through what you did to me. Now, do fuck off under a stone and die you utter cretin"
Leaving him made me examine my life in minute detail. I re-evaluated everything from friendships to what was in my knicker drawer. I left no stone unturned and when I was done I felt alive, like I'd been through a metamorphosis.