What's up with him?

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There's this guy that I really like. We met November last year as I applied for the same student assistantship program that pays students for solving computer network problems around the university. I've had a crush on him already since the first week I saw him. Last March, he told me he really liked me. On the last weeks of the month, before summer vacation, we were always hanging out, not really dating, but hanging out with our friends. We would ride the same public vehicles, just talk about random things, even when there were always moments of awkward silences. And then summer vacation came. It's been two weeks since I saw him again. On the days after that, things started to change. He doesn't do the same things to me anymore. We don't talk as often anymore. I actually miss the way he would look at me (as corny as that sounds). Now it's like we don't know each other anymore. It's like we're back to zero. I could clearly see that he's not as interested in me as he was before. I actually don't know what caused that. Not that we were anything before, or that I want us to be something, but I actually miss those days when we were a little close to each other. I'm afraid to ask him what happened because we weren't anything, and I don't want him to think of me as overassuming. Really, what's up with guys who stick to you one day and then just suddenly stops talking to you the next day?