Hey Lissie: Sounds like you're getting the detaching emotionally part down pat. But if I were you - I'd detach physically too. I know it costs money but I hired someone to do the things I couldn't manage (or got the kids or a friend to help) and got my ex the Hell out of my house. I got so much better at that point. Just a suggestion.
He is INTIMIDATED by you. He is AFRAID you might date someone else - LOL! Serves him right. Look at SG's Ex. He is still doing the same thing.
They don't want us, but they don't want anyone else to have us either. How sick is that?