We were so close, but now he's so distant and I don't know what it means

Last quarter I got really close to a guy. We were like friends who were on the path to being more. At least it felt like it. I read all the signs and it seemed like he was interested in me and I sure was interested in him. We spent a lot of time talking and hanging around each other and even set it up so we had a class together this quarter. But as soon as this quarter started we began talking less and less. We see each other everyday during class but we don't seem to say more than the surface stuff. He's been getting really distant and not responding to some of my messages. Sometimes it seems like he's trying to get me jealous or something, sometimes its just like he's ignoring me. Is he playing hard to get (do guys do that? ) or is he not interested anymore, even just as friends?
We were so close, but now he's so distant and I don't know what it means
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