Is it a game ender? decide that now- It will keep you from doing something stupid when you confirm.
Do not ask her....if its true you will begin to start to see some real bad acting on her part as she begins to cover tracks.
AND.....whatever happens- you must remain in control....you will be alright
ME 38 W 37 T18 M5 D3 BD 1/7/13 PA Conf 2/11/13- Ongoing 2nd simultaneous affair Confirmed 4/19/13 W gets APT and begins transition out 5/29/13 First mediation appt 12/19/13