What does it all mean?

I have had a class with this guy every year for 9 years and we haven't even said 3 words to each other. For some reason...he just bugs me. I can't stand him or the guys that he hangs out with. But on the very RARE occasion we do happen to be on the same team or something I just notice he talks to everyone else but me...and when he does he turns really red. Well, I was out of town for a few months and when I got back I went to the movies. I went with a couple friends but at one point they were talking to people I didn't know so I just started randomly looking around...and then I notice soemone whip their head around in my direction which startled me so I naturally looked back to see who it was...it was him. He just stared at me kind of shocked and confused. His head was completely turned to specifically look at me and we locked eyes for like 4 seconds. Then he turned red and sharply turned his head around in the completely opposite direction. I felt stupid so I know I turned red. I just don't understand....is he doing that to be specifically crude to me? We ignore each other for nine years and then he looks all 'shocked' to see me? How does that make sense? What is it to him? He shouldn't have even noticed that I was gone! Ugh...I'm kind of bored and its bugging me...So what's your take on it all?