Why do guys flirt/ make you feel special when they know she’s not the one or he doesn’t really like her?

I kinda thought this guy was showing me some genuine attraction nothing sexual.. then he kind of started avoiding me a bit… I figured out that he was talking to someone else but she looks nothing like me… she’s a model and she seems cool..

but still.. why?

Why do guys flirt/ make you feel special when they know she’s not the one or he doesn’t really like her?
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