what's this guys deal?

I've known him for a year and a half now but we were in different classes last year now we are in the same classes but before he didn't pay much attention to me but this year he is always whisper something stupid in my ear to make me smile and laugh (but he whispers things in other girls ears so) and every time he sees me smiles and waves a bunch of people think that we should date and keep telling me he's not with anyone and they think he likes me but I'm like I don't think so but today he was like I'll leave you alone today and he did he didn't tease me or be all touchy on me like he always is and today too he was like if you want I can leave you only again and he has liked a few of my posts on fb and the other day I got mad at someone and after words he was tapping me to tell me was I still mad I think he wanted to ask me something and on the same day he kept touching me like what is his deal