I've read just this threat so far and the things I think you may want to consider are:
1. Set Boundaries - you mentioned that you did not want W to talk to other guys but did not express this idea verbatim. I would let W bring up this topic and then squash it as it appears. Don't ever bring up old history, even last week, it will just stir up the pot.
2. Daughter - As I don't have children, I would just say to prepare as best you can. If you can think of your situation as it happening to someone else, someone else is possibly getting divorced and you are fine, it may help you. Pretending you are ok during this process is vital.
3. Thought Stopping - This is what I struggled with at first. You could try wearing a rubber band and every time you think of your W, go give yourself a smack and you will start to forget her.
"Don't chase people. Be yourself, do your own thing, and work hard. The right people - the ones who really belong in your life - will come to you. And stay." ~ Will Smith
