Girls, how do you and/or other girls you know quickly decipher if he is a player or not when he confidently starts flirting with you?

Obviously most of the guys who start talking to someone he doesn't know are players, but I know some are not.

You're single and ready to mingle but don't wanna waste time with a player. What's your game plan when an attractive guy starts talking to you?
Girls, how do you and/or other girls you know quickly decipher if he is a player or not when he confidently starts flirting with you?
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