How could you hurt someone you vowed to love forever, so SOON after speaking that vow. Married Sept 2016 - Affair began April 2017. Like, what the actual F**K?
The answer to this question is at the core of your situation. I think you know the answer.
Me: 50, MLC/WW 45 Young kids Nov 2015: BD1 Apr 2016: BD2 Jan 2017: W filed Feb 2017: D final