I just don't know anymore...?

There's was guy in my 2nd period who I used to have a crush on, when I was crushing on him I acted as if I didn't care if he was around. Im pretty sure he didn't know I liked him since we never really had a relationship of any kind, we were just acquaintances. Ever since I stopped liking him, I notice that he seems to be noticing me a lot despite the gargantulous distance between us. Sometimes during class he would to stretch and I would catch him in the corner glancing my direction a lot. He has a history of being a player and a major flirt with all the pretty girls, but I can't be the next of his many victims because Im NOTHING compared to the girls he has screwed over. All of the now heartbroken girls are so gorgeous and skinny, whereas Im the homely, nerdy, awkward, thick girl with the glasses who loves history and God. I don't know what this awkward situation is going to but I need it to stop since we will probably be in the same class(es) next year. Advice please? WHAT DOES HE SPECIFICALLY WANT FROM ME? I can take harsh critisism, I've become used to it...