One of the things I have learned through my journey is to be an attractive man you have to be in control of your emotions. You have to be strong and that means resisting the urge to do things that compromise your values as a man. I am assuming that you are not ok with sharing your W with another man?
This is what you wrote: I have told her before I don't want to be her "plan B"
You should have said: I am not going to be anybody's fuching plan B.
Do you see the difference? It's a process but you have to get there if you want a real relationship with her or someone else.
Lastly about your question:
Your W is in an active affair, is toying with your emotions to get enjoy her fantasy world. If she then makes false allegations against you to the police, you see a lawyer the next day and you file for divorce.
Step 1. Move back into the house Step 2. Ask her to move out and remove all her stuff from the master bedroom
This $hit is not easy but being strong is the only way this turns out how you want it to turn out.
