This guy has really confused me...?

[cass93]

Why would he like stare at you from across a room and when you walk past look back at you one week and then the next week he doesn't look at you at all. We have been looking at each other for the last 10 weeks. Today I sat opposite to him on a computer and I got NOTHING... I actually feel kinda sad about it. I don't think he is shy because he doesn't seem the type and he has absolutely no problem talking to other girls in the class. I tried staring at him today but he didn't look once. Has he lost interest? From his twitter I can see that he is not short of female attention. I just don't understand...any ideas?