Baby Daddy Issues

So my baby daddy and i broke up right when i thought i was pregnant and a week later i took a test and found out i was pregnant but then i found out he had already moved on. He's really sweet and we have had fights about how i want him to leave her because she's trying to be my kids mom so i told him that i'm giving him until nov 10th to come back and be a father and until then he's not involved. i just don't think this stress is good for me and my baby. any advice?