Why did he say bye to everyone but me?

I’d consider him a friend and we have hung out and I always thought he enjoyed my company but today he seemed off. He just said “hey (my name)” but didn’t talk to me for the rest of the day and then when leaving he said bye to everyone but me. Tbh I got a bit sad cos I thought we were at least friendly. I just want to know if this is common or not? I’ve never really had male friends before so I don’t know how they are
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+1 y
No We are just friends
Why did he say bye to everyone but me?
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