What does it mean if a guy looks at you then leaves the room shortly after? Please read!

Anonymous
This guy (whom I have a crush on) was showing A LOT of the signs of having a crush on me such as the eye contact and looking away, the blushing, the nervous stutter, the overgentlemanlyness, acting as if I don't exist (Like ridiculously acting like it) and also getting close to my personal space. I deemed him shy though because of this and he never talks to me. Some days he will act really quiet and look at me a lot then the next day he will be super loud and ignore me, it's kinda annoying. Yesterday he was hugging this girl (who he kinda knows but only a little and I think she likes his friend) and it was kinda in a joking way but I think (don't quote me on this) he was looking at me the entire time cause when I moved he kept on looking at me while hugging her. I didn't really understand it but my friend said he was trying to make me jealous.

Okay, and today when I entered the classroom he gave me a shocked look and then glanced at me a few more times before walking out of the classroom, like he suddenly stopped talking to everyone and just kinda walked out. I've never done anything mean to him and I'm not super outgoing but I'm not quiet either. And then I didn't see him for the rest of the day. I'm really confused and I don't understand what his motives are. Could someone please explain this guy to me?

Thank you very much! I really appreciate it!
What does it mean if a guy looks at you then leaves the room shortly after? Please read!
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