He's Friendly with everyone but doesn't seem to like me?

So I started at a new job and one of the managers (he's around my age) is friends with heaps of the staff but doesn't seem to want to talk to me or become friends with me. I thought maybe it was because I'm new but then after a few months and more new people started he became friendly with them. However, sometimes he'll crack a joke or smile at me but then a few minutes later he's acting stand - offish. I'm friends with a lot of his friends but its like he is too cool or something to get to know me, or at least thats how he is acting. It's confusing and i don't know what to think.
He's Friendly with everyone but doesn't seem to like me?
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