Mine was/is a WAH. He walked away with an OW and is reinventing himself or at least trying to. As I've often said...you can't divorce yourself and he will figure that out sooner or later. If you want interesting reading, check out my sitch. My WAH is in a league all of his own when it comes to living a double life. And that's not a good thing.
I know how tough this is HB. I went through hell. I'm happy to say, however, that I went through it and things are much, much, much better on the other side. Truth be told, my WAH was an a$$ of epic proportions to live with...moody, resentful, secretive, absent 90% of the time... Once I was able to take the blinders off and remember exactly what living him was like and face my fears, dropping the rope got that much easier - in fact, it seemed to be the only sane thing I could do given everything I found out about him - especially knowing that I probably only know 25% of what he did.
One way or the other, if you follow the advice of the people on this board (I did not do it soon enough IMO), you will get through this and be a much better, stronger, confident version of yourself whether you end up reconciling or not. Do NOT be afraid to let go. It is the only way to get him back...assuming you will even want him back at the end of this.