I believe that is so key for the LBS, but then I have not been a LBS. I have been reading about it for years, and it does seem to be a pattern that when the LBS reaches the place you have, that's when the dynamics really change.
I have one question, b/c I suppose I missed something along the way. Did your WW know about this lady you had seen? I know of nothing else that will cause a ditched WW to suddenly desire her LBH....than to know another woman could be a threat to the W's position with him. This is important, Solo. If your W has no idea you've seen anyone else, then there's a chance she's legit. But remember, from beauty shops to the grocery stores.....gossip flies.
You are correct in saying you deserve better. Maybe your W wants to prove she can be better. Has she shown any remorse about OM? It seems she turned to you as soon as he dumped her, which is pretty normal for a WW. Have you seen big changes in her? Has she received any therapy, participated in any type of program, or anything that would help her progress to a better level, that would give some support to the possibility of having a better relationship in the future? Have the two of you discussed how things would be, if you did go back to her?
I hope you will not see me as being negative here, but rather seeing me wanting to help you. I will be thinking of you and praying for your best.
It is not about what you feel should work in your M. It is about doing the work that gets the right results. Do what works!