Why she looked at me?

I’m a guy (I couldn’t change my gender) anyway, I just wanna ask about something happened to me, I was just walking in the hallway when my crush suddenly got closer to me, about one arm distance. She looked directly into my eyes, and I felt nervous. At first, I didn’t look at her, but then I decided to. She kept her gaze on me with a serious expression, and we made eye contact for about five seconds. She didn’t say anything, she looked away, and I looked away too and walked on. What does it mean?

Why she looked at me?
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