Why does a guy I work with not talk to me but he talks to pretty much everyone else?

When I started working there he was really forward and upbeat but since then he has done the complete opposite. When I do talk to him he avoids my eyes but occasionally he will be super jokey with me. I don’t know what’s going on, does he not like me or something

Why does a guy I work with not talk to me but he talks to pretty much everyone else?
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