God, alright, I usually don't like to give this advice, but in this instant. I'll make an exception. In my opinion, a person is dead, if his brain is dead, because his/her brain is no longer alive. And in my opinion, a person is not alive, until he/she has an actual living brain. So, if I am a woman and is you, and the child is yet to have a brain, I probably want to get rid of the kid (but that is me. I don't know what approach you will take)
If you want to keep the child or is legally not allow to get rid of the child, then my alternative advice is, it is time to fall out of love with him. So, firstly, fall out of love with him and secondly, start shaking money out of him with child support payment!!! Also, if possible you can also consider dating other men, after the child is born
Of course, as a parent you have the duty of prioritizing your child. But I think your kid would be much better off with you, as a single parent or maybe even with a step father (depends on the guy of course).
Also, in my opinion he done you wrong, seriously, so, FALL OUT OF LOVE WITH HIM AND IF YOU ARE KEEPING THE BABY START SHAKING MONEY OUT OF HIM WITH CHILD SUPPORT PAYMENT!!! (pay back is a bitch)