She's engaged, but flirting with me. What does it mean?

Guy4Girls
I'm a 38 year old guy with a girlfriend. About 6 months ago, I met a cute 21 year old girl who I had no intentions of pursuing. We became acquaintances. She would come over to my work to see if I was working. She would see if I was interested in having breakfast with her. One day, she came over to see if I wanted to have lunch with her at the food court in the nearby mall. I said,"Sure. " She then got a menu from her work and brought it back to my work. She then turned her back toward me and showed me the menu with me having to look over her shoulder. I thought it was not only odd that she was showing me a menu with her back turned towards me, but that she was showing me a menu that I could go to the food court and look at while we stood in line. This action took me by surprise and I know she was flirting with me. What does it mean? Does it mean that she is not getting the attention she wants from her fiance? Does it mean she wants a one night stand? Help!
She's engaged, but flirting with me. What does it mean?
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