He likes you but he's shy. It's kind of like flirting, too.Or he is checking you out, and has a crush in you. Talk to him and see what happens, and get the gossip report on him.
Probably because he doesn't want you to think he's staring at you...and he's most likely thinking of something to say but is either to shy to say it or just can't find the words to say. Either way,...