Everything was fine until I mentioned the other woman— I asked if my wife plans on seeing her after we divorce and my wife is still living here. Yes, that was her plan!
Gently . . . what your wife does after you end your marriage is not something you can control.
Yes, it sucks donkey butt and it's enormously cruel and very difficult to deal with, but it is something you cannot dictate.
Sometimes you have to be willing to lose the marriage to save it. Right now, she has you at home and the OP on the side.
Think of this situation as described above as a three-legged stool. It's pretty easy to balance on a three-legged stool. You don't have to think about it, and it can be pretty comfy.
Take away one of the legs. Now it's an entirely different ball game. By taking yourself out of the equation and filing for divorce or at the very least a legal separation (if it is permitted in your state), you reduce her comfy perch to a balancing act. By going NC (No Contact), you switch the game completely. Now, instead of relying on you for the stability you bring and relying on the OP for the excitement, you reduce her to relying totally on the OP. In some cases, that doesn't work and the WW sees the folly of their ways.
If they don't see that they've been a complete failure as a partner, then you're ahead of the game.
My advice to you is to see an attorney and find out how the laws of your state are structured and what you can reasonably expect from a divorce. Knowledge is power. If you do not have children, I imagine it's fairly straightforward and splits everything either equally or equitably. You need this knowledge, as knowledge is power.
Additionally, if she could lose her job by fraternizing with an associate, you probably want to get out sooner vs. later.
None of this is easy. But staying and hoping things will change is a pretty sure guarantee that nothing will change. The "pick-me" dance is humiliating and debasing. You deserve better than that.
Cat