Why can't I stop flirting?

For some reason, i can't stop myself from flirting with guys, often I dont even realise im doing it. Usually I dont even like them, and if i do i lose interest straight after. From my point of view its harmless flirting, why should it be okay for guys to flirt with multiple girls yet, when a girl does it, she's automatically a slut. im just having fun and whatnot, but it sometimes ends up with the idea that im 'leading a guy on'. Any advice?
Why can't I stop flirting?
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