17 weeks pregnant

I got pregnant by a guy I was on and off with and he already has 2 kids by someone else and those 2 kids mean the world to him. Well little did I know he didn't want anymore and now I'm pregnant by him and I feel he isn't gonna want to have anything to do with this baby even if he says he does ! When I'm around him for almost a month he acts like I mean everything to him but when he takes me home He barley talks to me he sends me about 2-3 text messages a day and that's it and he doesn't ask about the baby I'm carrying. I just feel like I'm being used and he texted me today asking me if he could come get me Wednesday night and stay for like a month and I'm just confused and don't know what to do. But let me go wayyy back when I first found out I was pregnant and went to the hospital he said " I hope for good and bad news talking about the baby he only hoped for good because of me . I just feel he wants me for sex.