You have to ask yourself if you are willing to live in an open marriage and how long you can put up with it. That will tell you when you confront your wife about the A. I personally had zero tolerance for an open marriage and I confronted her with it within about 15 minutes of finding out. What does keeping it a secret do for you? Nothing in my opinion. The next day after I found out I called the OM's wife and told her about it. My opinion was if they wanted to continue this destructive behavior affecting both families they would have to do it in the open with all parties aware of it. I felt it was the least I could do for the OM's W too. The A ended immediately for me and they have not contacted each other since.
After that Sandi has some great advice for wayward wives, WW's
Me:49 W:45 M:19 T:22 EA confirmed and ended 8/2014 S:19,17 D:9,5