I can relate. I know the feeling of being love or at least emotionally attached to a man that I know intellectually isn't good for me. I get the feeling this is true in your case. This may be very hard for you to do. I'd say let go. He sounds like a loser. Any man who would cheat on a girlfriend or for that matter, a wife who is pregnant I wouldn't trust. To use a rather old fashion term he sounds like a cad. If you can I'd get child support. Try to find a new man. This man is damaged goods including a strong possibility of STDS.