What does it mean when a guy says he's busy after a girl asks him to hang out?

is it a common way to reject a girl? why would he still stare at her make eye contact and be flirty chatting up a conversation if he didn't want to go out with her? do all men pull the busy excuse when they don't wanna date a girl or like her?
What does it mean when a guy says he's busy after a girl asks him to hang out?
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