What could this mean?

So there's this girl at my college whom I've met briefly before in a class we had a couple semesters ago. We had a very lengthy conversation, but no numbers nor names where exchanged. Fast forward to the present, I see her chatting with her friend in the cafeteria and as I was passing by, I noticed that she was looking at me very firmly. The other day, I saw her walking in the hallway across from me and she turned and looked at me. And most recently I was chilling in the cafeteria, and she was with a group of friends at a table far across from me, And one of her friends turned and looked into my direction, then I caught her looking into my direction. She had left, but her friend group stayed. When I walked past their table, I could've sworn I heard something along the lines of "that's the guy". This wasn't the first time this had happened too. One day I was in the cafeteria area, and she looked back and into my direction. All of this seems very weird and interesting to me. It makes beg the question, does this girl like me and want me to approach her? Or am i just delulu?

What could this mean?
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