Why is he so nice to everyone but me?

He's nice to everyone but me? When we're in a group he talks to everyone but me. By the way, we do know eachother exist. I mean out of everyone in our group he's probably the one that knows me most. The weirdest part is, he looks at me when he talks most of the time. I get it, when he's straight across, but he'll be at the side and still be looking at me when he talks. Sometimes I get confused if he's talking to me. but he isn't cause he's mean! So why do you think he's being like this?
Why is he so nice to everyone but me?
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