Why would a girl ask me why I’m nervous and if I have a girlfriend?

So there is a girl that i have a crush on and she noticed that I get nervous around her. I dont really know her, she is just a familiar face.

One day she asked me why I get nervous, I didn’t know what to say so I said “what?” And she said “no, you get nervous”.

then a few days later she asked me that question again and this time i said “i dont know why i get nervous”. She then said “do you feel nervousness around girls? Have you never talked to us? Don’t you have a girlfriend?” And i said that i dont have a girlfriend.

Why is she asking that?

Why would a girl ask me why I’m nervous and if I have a girlfriend?
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