Advise please?

I'm 18 and a half weeks pregnant. For about 2 months my baby's dad has been saying he wants to get back with me. I agreed. At first I thought things were fine but now I'm not so sure. Nothing has changed, it's still like we aren't together. He's with his mates 24/7 the only time I see him is when he needs somewhere to sleep. Which is about once or twice a week. Sometimes I don't even see him in the week at all. Even then, he doesn't turn up until late at night. Surely if he wanted to be with me he would be spending time with me right? I'm thinking he's just saying he wants to be with me to keep me happy, so he can keep using me for somewhere to stay when he can't be bothered to travel home from his friends house. I keep asking if he wants to be with me and he says yes. When i ask if hes just using me he says of course not. I just want to know if he actually doesn't want to be with me so I can forget about it, just speak to him when it involves the baby, and get on with my own life. It's not fair on me. How should I confront him so that I can get a straight forward answer? I just don't know what to do 😢