Guys, why do you pursue a girl and then freak out if they like you back?

majority of guys say, they don't like playing games, but then why is it when you're sending mixed signals and a girl suddenly turns around and says, "Hey, I like you." they freeze up or freak out?

is it normal for guys to flirt hardcore with you, and then the moment you show the slightest interest, they stop caring?
Guys, why do you pursue a girl and then freak out if they like you back?
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