my BF is a douche

[ReasonableLogic]

I personally think you should go away for a week or two, give him time to think and to realize how important you and his unborn child is to him. He's leaving cause he probably needs space, or he's stressed about having the baby (if its his first), or maybe of how he'll support his family financially (again idk your situation, but the recession is hitting pretty hard) . You should just tell him you're going to your moms or a siblings or even relatives for a couple weeks, look him the eye tell him you love him and just leave. Wait for him to call you first, if he doesn't, call him after a couple days just to check up on him and see if he's alright, then you could start expressing your feelings on the situation and say you're gonna stay a couple more days to give him more time to reflect.

Hopefully he'll miss you and want you back with him. The key is to have patience, being a dude myself, I need my space every now and then.