How can you be sure. Isn't there a possibility that now that her affair is out in the open, she feels guilt, and other man from LA might not be willing to take her on full time?
My plan would be to be lovingly detached, build friendship and give her affair time to self-destruct, but if she moves out my boundary could be - then you don't take any community property, i.e. I don't agree with this and I'm not going to finance it. If you leave then you have to finance furniture, dishes, etc. and you have no more rights to come and go from our house - change locks, etc. If she files for divorce I would contest it.
