I agree with the previous poster and add that this thing is over. Regardless of what happens in the future with this lady, I would insist that she move out. She can figure out how she feels somewhere else. It will make it easier for you too.

There is no trust between you at this point it seems. This sounds like torture to me, being in the same house now. I am so sorry you are going through this.
And I'm sorry your heart must be broken. You deserve so much better than this shabby treatment.
I wish you only the very best as you move forward...