Advice about my coworker

I need advice about my coworker. We were not really close friends we worked together and casually talked now and then but she found out I had a crush on her. Once she realised she told me she was going to start dating this other guy. At that point I gave up and tried avoiding her to give her space so I could move on. But then she became upset with me saying she valued our friendship but we were not really that close in the first place. I have been trying to move on from her but shes making it really hard for me to do that. Since then shes talking to me more and more, flirting with me at work and always trying to find reasons to work with me. I really like her but I’m trying to get distance so shes happy with her boyfriend. But shes messaging me every day from the morning up until she says good night. I remember I told her she looks stunning in a blue uniform and now whenever she works with me she always wears it. Even though in the past she said she hated the blue uniform and prefers her pink one she never wears it anymore. Maybe I’m overthinking things here but why wear something you don’t like? Is she wearing it because of what i said? Whenever shes upset she always messages me and says she needs me. Another time she told me she told her boyfriend about me and how amazing I am too. Shes always praising me up or saying something flirtatious now and then. When we talk at work or say something thats not really funny she laughed like its really funny but it really isn’t. Shes like this all the time now. She makes jokes about how I look in her eyes and try to seduce her or about kissing her. She very rarely talks about her boyfriend and a few times didnt seem impressed with him and other times says how great he is. All of this has been going on for a few months now. Recently I wasn’t feeling well at work and went home and she constantly kept messaging me asking if I was ok. I know friends care about each other but it was too much worry for someone that has a boyfriend. Shes told me her boyfriend doesn’t mind me talking to her too. One night we was messaging and her boyfriend was with her. But why spend all night messaging your male friend while your boyfriend is with you. It seems strange. Everyone at work has started to notice how close we have become too. What is going on? Is this really a genuine friendship? Is she testing me or does she have a boyfriend is developing some sort of crush on me?