When should you cut ties from your ex?

United States
July 2, 2008 3:26pm CST
Once I heard about a woman who was still having to put up with her husband's ex-wife twenty years after they were divorced. And I wondered why the guy just wouldn't cut ties with his ex-wife. I suppose you will always have to be involved with an ex in the event that children are involved. But once those kids get older, surely you wouldn't have to see the ex so much. Or, at least could arrange to have them in your life less. What do you think? Should the new wife have to suffer with the ex-wife? When should a guy cut off ties with his ex-wife, assuming that kids are not involved?