I think you fail to realize that he actively CHOOSES to keep his ex in his life.

I'm not trying to be harsh here, but I think you're in major denial. Facing the truth is gonna HURT.....i.e. He doesn't love you or maybe he's just using you.....so it's easier to blame the ex. I mean by the way you write you'd think that the ex has magical powers and has cast a spell on your guy so that he can't think for himself!

Bottom line.....give the ultimatum. Heck, really, I think you should just walk away. Maybe don't even walk away, just put profiles on 5 different dating websites and flirt with every single guy you meet.

If your guy asks what's up, tell him it's too late. He should've put a ring on it.