Rob,
When you feel yourself slipping, just remember, your agreement cost you $40,000 and months of anguish. There is no need to be "flexible". XW will just have to deal with the fact she no longer calls the shots. Use your energy to rebuild your life not deal with XW. The best thing you can do for D right now is make yourself whole and happy. You are so right, you are no longer responsible for XW's happiness!