Question about singing over parental rights...?

My boyfriend at the time and I had discussed starting a family. He has a ten year old daughter he doesn't see because he was 18 when she was born. The grandparents moved their daughter out of state with the baby. He also has a three year old from a previous marriage, so I thought he'd be a great father. Two weeks after finding out I was pregnan, he dissapeared. I found out he had a new girlfriend when I was 12 weeks. I scheduled an abortion, and couldn't do it. Now, I am 33 weeks along. I just found out his girlfriend is pregnant. I knew this would happen, as obviously if the stupid girl was stupid enough to date this man (she used to also be friends with his wife while they were going through their divorce) then she doesn't care about ethic, moral, and anything of that decent. I had been fighting the question of perental rights for a while. His ex-wife had told me he was now claiming the child wasn't his, and she was sure it was, because he was happy at first...until he met his new girlfriend. He never denied out child to me, although he doesn't respond to my e-mails...and that is the ONLY form of contact he has left me. So I am very confused. Do I take away the right of my child to have a father, or do I give him the right to not have a horrible father? Do I let my baby's dad "off the hook" by taking away his right, or do I try to collect child support from a man who his steadily unemployed? Does anyone know my options or know where I can find support?