What do I get him to want a relationship with me?

Well, it's really hard to say if he's interested in you or not because you haven't thoroughly explained how he behaves around you, how close you guys are, how long you've known each other, etc. Unfortunately, you can't force someone to like you. If you're really concerned about how he feels about you then tell him what's on your mind. Just simply speak from the heart and tell him that you like him and be confident in yourself. You have nothing to lose. The worst case scenario: He only likes you as a friend. Is it the end of the world? No. There are plenty of people out there that are going to like you for you. There is no point in stressing out about something you have no control over and over something that was not meant to be.