Given that my wife has been involved with the OM for over a year I feel that I did need to confront her about as suggested by SBH. I did take a much softer approach in that I did not giver an ultimatum. I indicated that she needed to figure out what she wants to do because she can't continue to live half in and half out of our marriage. I told her that I would support and work with her through what ever option she chose. No anger or threats.
She is going to meet some of girlfriends tomorrow night for a Christmas dinner. I am sure that she is going to ask them for their advice. This concerns me because by only hearing one side of the story they will most likely push her down the path of Divorce.