Marriage was already over, just not officially separated and out of the house.

She was a friend I was fooling around with, and when I moved out, it didn't stop. It developed into a relationship a few months later and here we are a year and a half later. She's moved in and we're quite happy. I guess I made the right choice.

Regrets and lessons to be learned: Be more upfront about wanting to leave and make it clear there's nothing to be saved in the marriage. She held onto hope we could get therapy and work through it, but I was already checked out.