My crush understood that I am into her and she started being cold to me what should I do and what does that mean?

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It can mean one of two things. She’s either not that into you, or she’s playing games. Either way, you’re best served by operating under the principle that she’s not into you. Best to just back off. She’ll warm back up when she’s ready to deal with you again.

Find another girl to crush on if you can.