1gr8dad, I'm probably in the minority but if I were you, I would expose your WW's affair to her employer. Since you have already written off your MR and chalk it up to D, I don't see any downside for you. I was in a similar quandary and although it has not ended my WW's EA, it ended the lies and manipulation and gave me a significant sense of vindication.
Me-LBH, 48 Spouse-WW, 48 Married for 19 years Son, 12 BD #1 - November 1998 (EA 7 months after wedding) BD #2 - November 2015 (same XBF EA) WW filed D February 2016 WW moved out April 2016