See a good lawyer and get all the child support paperwork ready. What a jerk.
Oh, I am sorry. That must hurt and I'm sorry he is a lier that deceived you. I would try to stay on the up and up and make sure his wife knows about the baby and that he is in contact with you. Some scuz ball men try to have a wife and keep something secret on the side and that's not cool.
So, make sure she knows about you. And if she dumps him because of this, I'd consider he isn't a good guy for you to be with with this history of lying.
anyway, I'm sure this is hard hon. Do you have a supportive family?