What does it mean when a guy texts you but only tells you hi and wave when he sees you but he talks and have conversations with other girls?

he’s my crush and I’ve been knowing him since Oct, so as my friend but she keeps saying how she talked to him and stuff and how she seen him today, but what that have to do with me lol…it kind of irritates me. (Ignore my pfp I’m actually a girl lmao)
What does it mean when a guy texts you but only tells you hi and wave when he sees you but he talks and have conversations with other girls?
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