Before I begin, im fully aware that it was an absolute stupid decision. It was back when I was going through a depressed phase, still smoking weed etc and being a nihilist. She's a married woman and I've worked with her for a couple of years now. A few months back we finally had said (I say finally because there was always something sexual there). I felt a lot of guilt and shame afterwards and vowed not to do it again. In work, she continues to make every conversation sexual. We both agreed that it's done but she always says afterwards "for now".

Admittedly half of me not wanting to sleep with her again is because her husband is crazy, the other half is not wanting to destroy more of her relationship (although they have both cheated)

In work now however, going back to the sexual conversations, she's also very self centred. I can tell she doesn't give a shit for my well being as much as she does making things sexual. I'm getting the feeling though that behind my back she's talking shit about me (because she's paranoid of people finding out). She spins it around and makes it like in the instigator. I assure you though, I didn't pursue her at all, on my side it just happened. I still made the choice but I'm illustrating just how easy it was not that I was trying.

Ever since I've kept my mouth quiet been polite but at times I've been very blunt due to not wanting to lead things to sex again. Honestly, she mentions doing it again whenever I go along with her topic of conversation. I'm sorry if this is bad writing I guess I'm posting this asking what should I do? I don't really like the idea of her saying shit behind my back even if it's to cover up what happened. To be honest it just makes people more suspicious. Its killing me inside to continue going along like it's all good. I want to confront her about it, I did vaguely before but she just took it as a damn joke. She does it all the time, even before when I told her something quite personal (after she told me something) she just responded as if it was some mundane worthless story.