I don't even know your WAH and I'm just pissed about the OW. I just have to say that and hope that you know I'm with ya.
I'd want to tell everyone, too, about his affair, and I'd do it. It could "ruin" chances of reconciliation in the future, but probably not.
The anger actually helps detachment and moving on, at least in my opinion. It gives you a spurt of energy to move away.
When you said "you are already dead" did you mean him? Like, he's already dead to you and this doesn't change anything? That's how I took it at least. . .