Relationship with an expiration date...

My boyfriend and I are breaking up when I leave for college next week. He seems really distant and I’m still surprising him and stuff. I have a gut feeling he’s talking to someone else or something and it’s killing me. I can’t stop crying because we’re breaking up and he seems totally okay! It hurts so much. Whenever I ask him if he’s losing interest or if he’s done with me, he gets defensive and said he’s not. But then it always leads to him getting even more distant. I’m heartbroken already over this break up and I’m not saying I want him to be, but it’s not normal to be totally okay with it. Right? Help. How can I read what he’s feeling?