boyfriends friends.

My boyfriend works a lot. He works every night all night and sleeps all day. He has this group of friends and they do not like me (I have never met them) and they tell him that this baby isn't his and that I'm a liar and they've called me fat and stuff and they're just not nice to me. But that's not really what I'm upset about. Whenever he's not working, has a day off, or gets off early he goes and hangs out with them to smoke some pot and he doesn't text back or doesn't seem interested. He seriously sees his friends every single day.  He tells me I'm overreacting but it seems his friends are more of a priority then me or the baby are. Today he had a day off and we were talking for the first time in awhile and he was like hey can I finish this show and I'll call you back, so I waited and waited and finally asked him what he was doing and he went to hangout with his friends. Am I over reacting? Whenever I say something he just tells me I'm ridiculous. Just need some advice