Quick background: Have worked this HB for over a year never more then passing hellos and such. She is in a relationship that is a little shakey from what I can tell. Recently due to a little Domestic restructuring of mine I have become free to play the field. Said HB has always made great eye candy but that has been all. We work opposing shifts so I never really knew her.
Set it up so I happened to be at work at the start of her shift and began chatting her up in the lot. Hit it off no prob gave her my number and within the hour she was texting me. Things escalated to the point where we met up for coffee and I kiss closed her there. Have met 2 other time since and she has escalated the Kino each time.
Today she texts me saying how she has to stop our meetings due to her guilt issues. Heres where I have my problem.. Do I;?

A- leave it be and see if she comes around? Stand the chance to loose out on her body=11, face=8 == HB9...(hate to waste it)
B-Pretty sure if I wanted to I could talk her away from BF with some well timed suggestion. But would probably make it a 1 time thing...

Considering that she works with you, a one time thing would be unlikely (FWB).

If, as you say, she was escalating the kino, then she really isn't that committed to her boyfriend, so feel free to break them up. Or even just lay her while she's still dating him.

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Every Saint has a Past, Every Sinner has a Future

Unless she shows you otherwise, respect her wishes and stop meeting up with her.