Falling for a girl who has a man. What's my next move? Do I leave her one or do I try and fight for what I know I really want?

Anonymous
Three years ago I had a fling with a neighbour but I was moving away for work in fall and we drifted apart. I ended up in a serious relationship with and we moved on. In May, I moved home and in recent weeks we have become close. Every person in our company have commented on the chemistry I like her a lot but she's been in a relationship for under a year. Oddly no one we work with knows this. There isn't a single photo on social media either. I told her how I felt. She said she feels the same but is very confused. That her current boyfriend is a nice guy and she can't hurt him. She's also been telling him anytime we hang out and has admitted she finds herself talking about me a lot. She didn't tell him about our past. We kissed at a work party 2 weeks ago and the day after, decided its best that we limt our time together. Last weekend she drunk called. Couldn't get a cab so I collected her and drove her home. We sat up talking to dusk. She told me she was hurt three years ago, that she thought we had something special and I just left. (Both in late 20s by the way). And that she feels something but is afraid. I told her how I felt and that I want to start something but she got upset and said she was confused and felt guilty. She caught covid the following day, so last night I left a parcel of some treats with a funny note at her home. She texted to say how sweet and kind it was and that she was stunned I would do such a thing. One day she admires my relentlessness and the next, she says it drives her crazy. I did ask her if she wanted me to back off and she didn't really reply. She is such a lovely woman & wouldn't want to hurt anyone. Do i give her space, time & back off or continue to see her, flirt and fight?
Falling for a girl who has a man. What's my next move? Do I leave her one or do I try and fight for what I know I really want?
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