I need help/advice. My problem is that the man I'm with, I'm going to call him "D", doesn't seem to…

I need help/advice. My problem is that the man I'm with, I'm going to call him "D", doesn't seem to wanna help me being there is a possibility that the baby isn't his. My mom seems to want nothing to do with me either. D just pushes the baby and I to the back burner. I don't really have anywhere else to good else I'd leave so I could get my thoughts together as well as let him figure out if he really does want this or not. The other guy, M, seems to wanna help with the baby. I don't wanna raise him on my own but I wanna make it work with D. Please give this mama advice. I want the best advice for my baby's sake.