I used to stare at a girl and now she has started staring at me?

I saw this girl in my college, and I used to stare at her sometimes, she get my attention, she looked pretty. But stopped looking at her, she was just a random girl. Now our classrooms are close each other and she has started looking at me each time she see me. What should I do if I wanna meet her?

I used to stare at a girl and now she has started staring at me?
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