Ok
So this guys been staring at me for like a year and a half now and it's been really creeping me out. First of all I kind of do like him,but recently I just facebooked him, and asked him why he stares at me. He replied by saying *** why would I stare at you and kept denying it and said he only stares because I'm weird then got really mad and asked if I could stop inboxing him because apparently I was the one who was creeping him out. Then a bit later he told me that I was blocked and deleted. I only talked to him because I was talking to one of my old friends and she asked him for me (this was before) and he said that I was the ckick that stares at him on the bus and wants me to stop. WHAT THE HELL!!
Anyway just today me and my friends were walking past the canteen and walked passed him, as we did he thought a was following him so his like "quit following me". Then after that and the facebooking he still takes another few looks. It was worse before this all happened
I'm so confuesd becausee even his friends made it clear that he liked me now that I accused him of something he like hates me now.

What happened?

Whether right or wrong, if he's gone to the extent of blocking you, and coming right out and essentially telling you to leave him alone, then he believes you are staring/stalking him on purpose.

I think that is what you should do, just leave him alone. Don't talk to his friends, or your friends, about what he's doing or why, or what you think he's doing to you (staring), and stop the ball from rolling.

Let it all go, keep your thoughts to yourself, and it will soon not be an issue.

K this guy sounds like he's playing around and its not worth your time to be thinking about him.
If you think this guy likes you, imagine what it would be like to be in a relationship with him. He doesn't sound very mature.. If anything, to answer your question of "what happened?": he's being a boy.
Maybe see what he does if you completely pull back and ignore him. See if he tries to catch your attention, maybe the situation will turn around.

Defenitely agree that this guy is playing around, what is the point of filling you head and wasting your time with unwanted drama in this manner. Move on, forget about him, and stop playing the dumb little games as well.