Main reason why girls give repetitive quick glances?

I know it's completely ambiguous but I am just wondering as to what "the main reason" why girls would quickly glance at guys repetitively. Thanks.
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I am starting to get an idea as to what it means now, thanks a lot for those who answered! (:
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Gg
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I like the answers!
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Hello
Main reason why girls give repetitive quick glances?
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