Why is he so standoffish and unfriendly with me but friendly with other girls?

So there’s a guy I recently met at the gym and we finally introduce ourselves and said hi a few times after that. He didn’t shake my hand or anything. He’s friendly in a one on one scenario. But we were at an event and he kept blanking me out, talked to some other girls we were around, introduced himself to my friend I was with and shook her hand, he seemed happy to be there. He didn’t talk to me much except a couple sentences. I’m not a weirdo or anything so there’s no reason to be hostile. Could he like me but is shy?

Why is he so standoffish and unfriendly with me but friendly with other girls?
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