Guy's Behavior

Whats wrong with him?

My guy friend asked me that we should meet up and I was cool with that because we rarely see each other at school. Later that day I met up with him and we were talking like we always do as I'm talking to him I realise he's a different person , all of a sudden he's shy and nervous , I don't know him like that. After I bid him goodbye I looked forward and carried on walking but then I looked back to see if he's still on sight , I caught him checking out my ass and he smiled at me as if he didn't get caught. The following day , when I saw him at school he hugged me like always but it was cold because right after he hugged me he left and acted like nothing happened. I even thought maybe he regrets meeting up with me the previous day... he's been avoiding me face to face since then

Whats wrong with him?
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