Guys: why would a guy act so distant with me but it’s very sweet with other people?

Ever since I met this guy, I’ve treated him nicely, I greet him, I smile and I’ve tried to get close and get to know him but he is always very serious, distant and cold with me. I notice that he acts differently with other people/girls, he jokes, laughs and smiles so much more with them. He acts more free and relaxed with than he does with me. So I wonder why would a guy act so distant with me but be so sweet with other girls and people in general?
Guys: why would a guy act so distant with me but it’s very sweet with other people?
Guys: why would a guy act so distant with me but it’s very sweet with other people?
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