The H is taking the spineless weasel's way out, by sticking his head in the sand, saying nothing, admitting nothing and 'not wanting to hurt anyone'
Well that ship has sailed. He hurt his wife. The OW conspired in that at the time, and is trying to do so again. As much as I understand her desire to take the gloves off and go for the OW, it's not her fight to have.
I totally get why the OP wants to set this bitch straight, but it's not her that needs to be snarling at anyone.
This 'man' she married fucked up, in everyway imaginable, but what he doesn't do is bring anymore of this shit home. He needed to head this off, man up and protect his family. The one HE nearly destroyed.
Bottom line, OW needs to be told to Fuck off, by him, not OP. Definitively. His pussyfooting about ois encouraging the OW delusion, and fuelling her attempts to respark the fire. OP shouldn't be expected to do a thing. she needs to maintain radio silence as far as OW is concerned, and her well deserved dignity. The old shit stirring frenemy needs to be told that his tittle tattle is unwelcome, that neither H or OP wants anything to do with OW, and that he needs to pack this sensationalism in.
The softly softly approach is hurting OP, and it has to stop.