You can't force the issue, I personally would look at raising the baby on your own, he may just need time to come around, I would continue as if he is not in the picture if he comes back it's a bonus good luck
Hopefully he will come through and be daddy to the baby. You know? Like every kid wants a dad. I would keep communication open but loose. And take every opportunity to have him bond with his child once here. And this is just me, but unless you don't mind or are independently wealthy or something, he should pay for his kid. I know that can make things a little less cordial but it is his duty.
How are you doing in the pregnancy, by the way?
My advice. You're not doing the baby any favors by not going after him for child support. File a paternity suit against him and leave it at that. If he wants to get involved find out about his background beforehand because it sounds like this guy was a total stranger to you.