Guy advice!! What do I do about this guy?

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Last weekend a really hot guy from my school dm'ed me on twitter saying hi and we started talking for awhile until he asked for my number and then we texted the rest of the weekend, I even suggested that we hang out sometime and he seemed into it. I had only talked to him once before this in person and we have a class together but we're not really friends. So on monday, I saw him at school multiple times but everytime he didn't acknowledge me or talk to me when he could've. I'm not sure what happened between the weekend and monday but we haven't talked since and I have no idea what to do! Even though he's really hot people consider us in the same league; it just doesn't make sense that he's acting like we don't even know eachother.. Help!