Why would a Guy act indifferent if he likes you?

hammylemonade
At the beginning of the year I had a class with a guy. I noticed he would turn around and glance at me really, really fast, then look forward again. He'd do it like 25 times a class, no joke.

I had to present a paper and pass out some cookie models, when I offered him one he had his arms crossed, looked down, and just shook his head no.

When he would be by me he just acted indifferent. I'd never really spoken to him before and I honestly thought he must dislike me or something.

Then one of his friends accidentally gave it away that he likes me. He still acts weird to me though. Why can't he just smile?
Why would a Guy act indifferent if he likes you?
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