Just Alone

I am 22 years old and I'm already a single parent. The father of the child that I am pregnant with now is in a bind. He is 42 years old with four kids and three different women that he had them with. I DO NOT want to have an abortion but that's what he's pushing for. I have had an abortion before and I remember the empty sick feeling that ir gave me for the lonest time. He keeps saying how he understands what a hard decision that is but he doesn't. He isn't carrying this baby inside of him. I wake up every morning and don't have the luxury of pretending this isn't real. I have the symptoms to remind me. He doesn't understand. I think that he's being selfish with the whole decision, it's all about him. I just want to be clear on what I want to do but first I have to figure out what that it. Any advice?