Why does the fact that is in the WSW section bother you? It seems from your messages that it bothers you more than if it had been in the WSM section. If she was always open about a certain sexual fluidity, then what does it matter? I think many women are more fluid in their sexuality than men.
That said, I get the pain of finding out that the W is looking around for other people - even if we suspected it before, when it is thrust into our faces for the first time, it stings. My W told me in person (4 months post BD) that she was casually dating, and it was a huge blow.
Is there a boundary that you have related to this? If she is actively looking around or dating do you want to continue with your current living situation? You can't control her desire to date, or even whether or not she dates, but you can protect yourself.
W 34 Me 42 Married 7 years together 8 0 kids 1 beloved dog BD 4/6/2018 I moved out 4/7/2018 I moved back in alone 8/05/2018 I file 3/06/2019 D official 5/7/2019