Jim, I feel your pain. Living in the same house with my H who didn't want anything to do with me was the worst. I kept reading all this advice about keep them there, you can show off the 180s...but I felt like such a doormat tolerating the whole thing when he wasn't interested in our marriage. I cried too much. And he kept trying to act like everything was normal and I was already his ex...constant torture.
I hope you find the same peace I did when and if she leaves. The air in my house seemed to return and he actually seemed glad to see me a few times after that, not living in the same emotional tug and pull environment. In fact he came home a few times to stay and kept prolonging the dates. (And then pulled away again). So it goes.
Hang in there!
Mid 30's Psych-abusive M with violent tantrums from XH D 9/15; NC forever on