Girl's Behavior

Girls, do you sometimes get more nervous with a crush as the interaction goes on?

I know I do sometimes. I can start out relatively confident and normal, and as the interaction continues, I start to slowly lose my cool and become more nervous. Not anything extreme, but noticeable I suppose (smile less, stuttering a bit). Like I notice how pretty she is, and see signs she could like me as well, feel a bit intimidated (like through I think is meaningful eye contact) I had this interaction with a girl that went along like that on my side, but I'm wondering if it was not the same (but on a lower level) on her side. We were both "careful" it seems in our conversation but engaged and asking questions. In particular, we were both awkward when we parted ways.

I also briefly dated this girl once, where on the first date she seemed pretty cool. She would even stare in my eyes for a long time in a moment of silence. But on the second date, she seemed quite nervous. I don't remember if it got worse as the date went on (possibly) but she really didn't feel as comfortable as the first time. When we parted ways, I asked her to see her again and she accepted. She also gave me a book. But when I made plans, she refused (I don't remember what she said exactly). I asked again later, and she cancelled last minute at night. I do know she has/had depression and pretty big issues with self esteem. Or maybe she just figured out she actually didn't like me that way.

Is becoming more nervous around someone over an interaction or over time more of a good, or bad sign? Nervousness getting the better of you? Figuring out you don't like romantically the other person? Can you show both signs of romantic interest and lose interest in the same short interaction?

Girls, do you sometimes get more nervous with a crush as the interaction goes on?
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