My boyfriend treats me like a little sister! What do I do?

First of all my boyfriend and I are both 20. Next semester he will be studying abroad and I don't know if we can stay together. When we first met, things were almost perfect, but now, it seems like the only thing he enjoys doing is making fun of me. I can't remember the last time he said anything complimentary/sweet/romantic to me. I never call him, he'll call me up and just frustrate me by being confusing and copying what I say, like a little kid! It's like he gets pleasure out of calling me up to bother me. I love hearing from him when he's being sweet, but he never is anymore. He already admitted to me that because of his work and going abroad, that we were "on the rocks" but he claimed he "wanted to try and fix it". I feel like I'm the only one trying.he's just goofing off like a 7-year-old! What do I do?
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I should point out that I've told him to stop many times, and once he even sincerely apologized in a long letter. But he still acts like a bully on the playground!
My boyfriend treats me like a little sister! What do I do?
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