Most Helpful Guy
After a break up it is really a battle between the 2 of who can best move on. In his own mind this is his way of showing "look, woman wants me. I can move on better then you can haha"
It may sound stupid, but it is how many guys do in order to feel better.
The best you can do is pretend like it doesn't bother you. Go on and live your life and have some fun.