Should I stay with him?!?!?!?

Ok, I'm 18 and he is 17. We have been together almost 2 years and We just had a baby together in feb. He doesn't pay child support. He has been living with me on and off since we found out I was pregnant. I live with my mom. His family and his family situation is not the best and they have NO money. My mom doesn't have all that much money either. He loves us and can be sweet and kind. But he has gotten to comfortable an takes me and my family for granted. We fight all the time now. We argue and go back and forth about stupid things. I try to talk to him and he says he we will make things better and they get better for a few days and then get awful again. We are both still in high school, I'm graduating this year and he isn't yet. He is immature, which is to be expected I know, but he recently got into a huge argument with my mom during which the police almost got called and now he isn't allowed near my house. I take care if our son full time and go to school and everything else and it's just so hard. I love him, really I do but I'm starting to think this relationship is more work than I can handle. I don't want to be alone or do this alone either. My family wants him gone and gives me ell about it all the time. I don't know what to do. This whole situation hurts so much. :(