And we're here to help dig with you! Great attitude M (and I love that quote).
One of the most challenging parts of this process for me is recognizing in the moment when we're going off track. Sometimes it is due to habit. Sometimes it is due to trying to steer things as you say to the way they "should" be or we want them to be. Other times lingering emotions get the best of us.
While your W didn't file for D, she's "fired" you in a different way (via infidelity). The old marriage/relationship is a goner. That is a really difficult pill to swallow given all you likely put into it. As Kind says, divorce doesn't mean things are over forever. It can mean you regain your confidence in yourself, control over your feelings, and operate from a stronger position to decide IF you want to allow W to show she deserves you back.
Also, I'm truly glad to see you catching yourself and course-correcting. Keep the momentum rolling, especially the self-awareness you're demonstrating.