I don't know that I would advise you to walk out on your H, especially with your S left behind. I forget how old he is. He will feel awful and insecure.
Also, as folk here have pointed out, might it not jeopardise your case if YOU are seen to be the one to walk out?
If you feel strongly that you can't be together while he is with OW, get HIM to move out.
If he means business about there being nothing between him and OW, then he should pledge to you that their days off never coincide. If he can't do that, it shows lack of willingness to be up front.
After my H left, he told me and others that it is what *I* wanted, turns out that my saying to him when his behaviour was abominable that 'I won't stand for this behaviour for ever' he thought I meant I was going to walk out. And we aren't talking about his EA with OW, but just general bad behaviour, unprovoked rudeness etc.
Livnlearn
"The unexamined life is not worth living" - Socrates
