Why would he keep staring?

So this guy ( used to be a friend ) , we were classmates , we used to talk 24/7 but just facebook he never talked to me in real life , i tried several times then i got sick of his ignorance , and whenever i stop talking to him he starts bragging about it , Wtf, and whenever we meet in class he just can't get his eyes off me even my friends noticed that , i caught him a lot too but that didn't stop him anyway , last thing he blocked me -__- for no reason but he kept staring , he undo it this year and he started liking my pics on instgram , he sent me two messeges but i ignored him. Why would he keep looking at me anyway?
Why would he keep staring?
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