i think it is a couple of years or so after the divorce
I'm sorry about your situation. Some men are good at making children, but stink at caring for them. You need to make the best of this and care for your child. He has a legal responsibility to provide support for any children he fathers.
Because of this situation, you have to do the right thing for the child. If you let the father slide on child support, he won't do his part. Fill out all the forms and let the system figure out how to make him pay.
As the child's only parent, you are the sole custody parent. If the man wants to grow up. You might consider allowing him to see the child. But I would make that something he had to earn. He should be 100% behind you. Your carrying his child. I don't care if he hates you. The fact that his child is inside you should make him act like an adult. A real man wants his child cared for and happy, even if he can't get along with the mom.
Do you think he would be different if you weren't expecting ? If you say yes, than you know who your dealing with, a little boy looking for a good time, not a man.
I suggest you look for real advice. A woman's group or an agency that can make sure you don't just get ignored by him. Just be careful, if he deserves custody, he has to earn it. By paying support and working with you. The fact that he is the father means nothing. You know you will love your child. Find a man that loves you and the child. The other one needs to pay up and grow up.