Why does he keep looking at me?

this is whats happening but i don't know why. His name is Cody we use to talk to each other, a lot but now it barely anything. We have different cles so that why we don't talk. Just another ramdon person in the hallways at school also another friend on myspace. Its been a long time now. Like a lot of times i catch him staring at me when i p the halls, none of my friends notice but i did i could feel someone looking at me. That makes me real feel really weird. Sometimes when i catch him staring at me we stare into each other eyes and he waves at me. I say that was weird. Today at lunch me and my friends were at the concession and him and about three other guys were with him. I was standing there talking to one of my friends on the right side of me. They (cody and the rest of his friends) when my friend on my left whispered 'Cody staring at you' i said i know then that when it was our turn to ask for something or buy an item. They (cody and the rest of his friends)And when i was walking with the stuff in my hand. Cody asked if he could have a hot cheetos. But honestly i bought the stuff for my friends so i gave him the rest of my money and left. Other times hes staring at me. I just want to know why hes always doing that? Is it because i have something on my face or what??