Take the money that is due you and run! You are an

intelligent woman who can get a good job and make a good living. You won't have to put up with his nonsense. Think about it -- he is really not a very decent man -- he betrayed his wife with you, and now he is betraying you with another woman; the pattern will never end. Do you want to spend the rest of your life wondering, worrying and fighting with him?

It is too late to regret getting invovled with him in the first place and too useless to be resentful. So the smartest thing to do is to cut your losses NOW, heal your wounds and move on -- for yourself and your child.

I feel your pain, but be strong! Best wishes!