Do shy girls regret rejecting a guy? Do they do anything about it?

there’s this girl at work I have major crush on talked to her as much I could since we don’t work in the same department. Whenever I would run into her she gave off shy cute vibes with good eye contact and I felt a spark. So after continuous interactions I eventually built up the courage to ask her to have lunch together. And she said “I’m good” with a nervous smile. And then she proceeded to completely avoid me for about 2 months.

Then I noticed during lunch she would sit in areas that she can see and observe me but I couldn’t see her. So one day I decided to talk to another girl when she was around cause I knew her from talking to her before. She was laughing have a good time blushing and I noticed my work crush that rejected me was staring at us the whole time and gave off some jealous energy. She followed up the next day by sitting with a guy and they both kept looking at me to see if I was looking at them and I didn’t pay any mind since they sit with each other from time to time but I could tell it was some jealousy involved. Then when that didn’t work she avoided me for a little more.

Then out of no where when I was in lunch it’s an open area with a bunch of seating options she came and sat right next to my table and was staring at me the whole time while putting her stuff down adjusting her hair and side eyeing me. I did not acknowledge her since I wanted to respect her boundaries and the rejection it’s work so I’m not gonna push it and make someone uncomfortable if I’m reading it wrong.

And now whenever she sees me she just stares at me very hard and when I look back at her she doesn’t even look away. Not sure if this her showing she regrets rejecting me and wants to give it another go and scared that I might reject her back. But since that one time she sat next to me I think she’s scared of doing it again. I’d love to give it another go but I don’t wanna force it. Waiting for natural run in so I can at least say hey and break this awkwardness she created

Updates
7 mo
I didn’t talk to the other girl in front of her to intentionally make her jealous, they work in different departments and I know her from helping her on a previous day and we’re talking about Halloween. I don't know why everyone is so harsh on me saying I’m delusional or that I fucked it up.
Do shy girls regret rejecting a guy? Do they do anything about it?
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