I don't know anymore

So I'm in class right now, and I don't really know how to feel. See, I like this guy but he doesn't like me back so I'm really hurt about that. He made it seem like he was kind of interested. He was all flirty with me over Facebook, but the next thing I know he said that if I had actually kissed him that he would've run away and never spoken to me ever again. Its hard to be the person that always has to ask someone out and is never asked out themself. It puts a lot of strain on the heart and brain because you wind up overthinking the entire thing to see if it will even work out between the two of you. I hate the fact that nobody likes me enough to just come up to me and ask me out. I HATE MY LIFE RIGHT NOW.