Its hard at first, but I did get to the point where I looked at my unfortunate marriage to my AH as a good thing in that it has led me to deal with my issues, something I probably wouldn't have done otherwise.
Why is it that he is moving out slowly? Personally I would set a deadline, change the locks on that deadline day and leave any of his stuff he hasn't moved out of the place out on the lawn/yard.driveway. Don't let him string this along any longer than necessary. I see it as yet another way to manipulate you and continue the drama longer than necessary.