Girl's Behavior

What does it mean when a girl keeps glancing at you?

For a few classes now, this girl that has been sitting a few rows over from me in class and keeps glancing over at me. Literally like 20 times a class. Once I looked at her when she wasn't looking and she immediately turned her head over to me and looked me in the eye (as if she was still looking at me at the corner of her eye).
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What does it mean when a girl keeps glancing at you?
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