I want to get back with my ex Boyfriend. But he is gonna have a baby, and he wants me back. What should i do?

He is with the girl right now and he comes to see me but we do not have or anything he make it his business to call me and see me. his girlfriend knows where he b when he is missing in action. I really want to b with him but what is holdin me back is that he has a kid on the way and he might jus leave me for his babymomma. but he said that he would not.