Dear lostmind,
I'll tell you how to find your mind. Leave your man right away. This guys obviously hooking up with his ex. There is no need to live with his ex to be a responsible father. I can't belive anyone would fall for that b/s.
So what are you planing on doing if you stay with him? Live with his ex too? I'm sorry you're being screwed bad by this guy. He is irresponsible. period. He's being reckless with your heart and you shouldn't put up with that.