Tofbrks what is the current situation with your WW? Is she still in MBR or home? Does she work? Have you secured your finances?
It may help you to get some advice before you call her out. My WW's turnaround happened upon A being outed, I immediately kicked her out of MBR and shortly after gave an ultimatum, her last contact with OM was the day after I found texts and immediately confronted her.
M - 9 1/2 years 5/5/16 - Bomb drop - 3 week EA 10/31/16 - We sold house 01/10/18 - D Finalized