36,
You may be suffering, but honestly, you are neither weak nor pathetic. You have been remarkably strong and resilient in the face of sustained and prolonged attacks and mind games from your WW, of which this 'counselling' dinner is just the latest manifestation of her ongoing attempts to force a conclusion that she wants onto you.
As ever, 36, trust Catwoman.
Please 36, contact that couple and thank them for trying to be well-meaning, but tell them that your mind is made up, and that you are not going. As other posters have said, it is just another attempt by your wife to ambush you using other people, as she did with your son's 'surprise' appearance at the lunch she arranged with you. Who knows who else she will spring on you if you go to this dinner tonight? Your sons? The OM?
I repeat, out of concern for you, please do not go to this dinner. It's aim is obvious, and it is obviously instigated by your wife, for her benefit, not yours.
What is this couple going to say? That you should just rug-sweep and accept everything your wife has done? You say, in frustration, that you should not have to be where you are, in that position. That is completely true. But the reason you are there is because your wife forced you there, just as she is trying to force you to attend a dinner at which you will be told to not divorce her, which is exactly what she wants, and the total opposite of what is good for you.
She doesn't love you; she loves controlling you. There is a difference.
You have spent months trying to have meaningful discussions with your wife, and she has ignored everything you need, told you that you have to accept her right to cheat repeatedly, and refused to co-operate on transparency with her communications. So what great revelations or changes in her behaviour are going to be announced at this proposed dinner? You are going to be told to give her another chance, cancel the divorce, and surrender everything you believe in.
Is that couple really going to magically transform your wife into someone completely different from who she has been so far? Are they professional psychologists with a proven track record of miraculous transformations? If not, what on earth is the point of going to that dinner?
If I was there advising you, I would tell you to cancel the dinner, thank the couple, and ask them if they can encourage your wife to sign the divorce papers if they are still going to be having dinner with her. The sooner you get done with your wife, the sooner this whole nightmarish carousel ride will finish.
I know we have never met, 36. but honestly, I do really care about you, and I really think you should not go to this dinner.
Your wife is a self-centered, lying bully, and THAT is why you are where you are today. In light of that, why co-operate with anything she has instigated for her own benefit?
Sending strength and best wishes to you. I am so sorry you have been put through all of this by someone who was supposed to love you.