It's as if by him acting in this way he is reassuring himself that he is ok and dealing with it. It's like he's de-sensitising himself by being cruel to you. You need to do things your way and tell him that he needs to be at least on speaking terms until everything is all sorted... and that it is unfair for him to tell you of his sexual conquests which you do not need to hear about - what benefit is it to you? It is as if he is trying to make a point. Rise above it and remember you split up for a reason. You can find someone who does care a million times more about you. I wish there was a medicine for relationship break-up and hurt :( Good Luck.x