If you've read DR, you'll know to discount almost all of what the WAS says. Only later will he see his part in things. Right now, he's rewriting history, if only to protect himself for his decision to D. Let that be his issue, not yours.
Control what you can - you. Take extra great care of yourself, with the goal of improving your mood and having fun or fulfillment without him, and that your boosted positivity will be noticed by him.
What sort of positive changes or goals could you set for yourself for the upcoming month?
Post em here and we'll do our best to help with feedback.
What works for you?
