baby daddy

I am currently with my boyfriend, and I honestly just can't see myself spending the rest of my life with him like I did in the beginning, we are expecting our first child less then a month, he hasn't bought one thing for her, all he does is spend his money on weed, and food. He always says I'm a bad parent, and our child will like him more, he lives with me, and just leaves without telling me, and is never home. I have spent most of this pregnancy alone, and it honestly saddens me the kind of person he has become. Yes I have tried talking to him. Just a little rant. I don't know what else to do with him. He has become a completely different person.