I don't think my boyfriend cares...Help.?

So here's my situation. Me and my boyfriend were dating for quite a while then all of a sudden he broke up with me. It took me a while to get over it but eventually I moved on. Now we got back together. but He's like incapable of feeling. He acts like he doesn't care and tells me he doesn't have feelings period... But he does care about me. I've tried talking to him about whether the relationship will ever get to the next step adn he doesn't have anything say about it. Once he said possibly. He talks about other women yet more subtly like he thinks I don't know what hes talking about. I love him and I want to be with him, b ut I don't think he feels the same. He doesn't ever open up and tells me how he feels. He's one of those well I'm here ain't I kinda guys. Do you think it's even worth trying to have a relationship with him? It makes me feel insecure, I'm always having to worry about him breaking up with me. I have so many mixed feelings it's insane, I feel like I'm going crazy. What should I do!?!