why does he act differently around me, when his friends arent there?

I like this guy in my sociology class.

basically, he was acting really weird around me....staring at me and avoiding me at all costs when he found out I liked him. My friend basically said "I think she likes you" and she then asked "do you like her?" and he said to her "stop making this awkward.." but he didnt say no...which wouldve been better because at least i'd know.

now THIS is really confusing - the other day i saw him walk through the corridor coming my way to go to one of the sociology rooms, but his friends werent in there. he saw me in the hallway, stopped when i turned the corner, smiled nicely, pulled a playful face at me and went "Hey." I said hi back and told him his friends were in a different room. he said "thank you." and went off..

why is he acting like this? hes sending me mixed signals and its annoying. he is a little weird when it comes to staring, i was laughing in the back of class once and he turned to look at me briefly, i could see it.

Once, i caught him PROPER staring, like GLARING at me. i caught him staring and he didnt turn away for about 10 seconds. really creeped me out. what the hell is going on with this guy?

why does he act differently around me at different times?

does he like me? is he shy?

when he said hey to me in the corridor really made me wonder if he acts differetly around me when his friends arent there.

i'd also like to mention that we have a LOT in common. seriously movies, music, everything...

help?