Kitten- forgive me, as I do not know much of your sitch. Cheating for me as well is a deal-breaker- however, I have found that I am mitigating the actions of my WAW based on the fact that we were both lonley and unhappy and did little to address the issues of our M-in a timely fashion. It's funny b/c in my sitch we were at the point of making the changes, then the bomb that same week- but no mention of OM. Now had the M always been strong and a great bond, connection and the SP steps out, forget about it- done, done, done.
I am glad you are making the best choice for you. I think its a lot easier to seek D when you have been the one betrayed. I am just an LBS who wants one real chance to have the M we both deserved.