I am very sorry you and your unborn child are dealing with the stress of this cheater. Its the worst thing to run across your significant other cheating and then him not coming clean when faces with the fact he has been caught. You found out, and you know deep down that this is more than them being friends, quit doubting your self. You are right about this. Please dont continue to put your self and your baby through this. Leave now. Get help. It will not be easy, but you need to thinking of what is best for you and your child. He has made his bed, let him lie in it. I really feel for you.