Why does he raise his eyebrows up when he sees me?

xPurpleRosesx
So I know this guy at school and we started talking when we went to Spain with school. Now when he sees me in the hallway he would just raise up his eyrbrows. It kinda looks like he wants to say that he saw me... but it looks weird because he doesn't say hi or smiles. He just raises his eyebrows up. He has a girlfriend by the way. But why would he do that everytime he sees me?
Why does he raise his eyebrows up when he sees me?
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