Next time before she gets into her manifesto, stop her and say that she cannot and will not control you and your actions. That what she's experiencing is a result of HER actions and not yours. And that you felt morally obligated to talk to tell OM's W to protect her family and it had nothing to do with your W. Then end it.
Strong but firm. Think steely eyed Clint Eastwood where you are just looking at a crazy woman talking.
I mean she PUNISHED your D by not taking her to her party.
I understand this approach but won't this only lead to a nasty argument? I thought I was supposed to avoid arguments at this stage.
Me:35 W:30 D:4 S:1 Bomb: 01/08/15, discovered EA & PA In House Separation: 01/14/15 W moves out: 04/05/15 I tell OM's W about A: 04/15/15 W serves D papers: 06/19/15 Mediation: 09/16/15 D final: 12/01/15