Oh my dear Rzr...(((Rzr)))...I know this is all so tough for you. I feel so badly for you, but my thoughts and prayers are with you. You are getting great advice and I really can't add anything to it, but know that I'm rooting for you from South Arkansas.
For what it is worth, though, my XH was the WAS, when he did leave, it got easier for me, made detachment easier, so maybe S isn't such a bad deal. I don't wish D on anyone, but in my case, my X was dead-set on it and there was no going back and now that he is out, my life is easier without having to worry about what will set him off or what he's thinking or whatever.
Hang in there and keep reading all this wonderful advice.
Me 52, H53 Bomb drop 9/29/2014 Divorce from XH final 12/17/2014 Marriage #2 12/31/2019 5 adult (step)daughters (3 from XH's first marriage, 2 from current H's previous relationships) 6 grandkids