Why do some girls act interested one day but not the next?

Anonymous
Why do some girls act really interested in you one day (flirt a lot, stare at you, try to talk to you, ...) but in the next days they act the opposite (ignore you, act cold and uninterested,...). And then after a few days (when you're already thinking they're not interested) they come back and do the same thing all over again.

Why do girls do that? What does it mean?
Why do some girls act interested one day but not the next?
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