I agree with that. I don't entirely believe that an affair is just a symptom of a bad marriage. Without the affair, the issues could have been worked through. We've all had ups and downs in our marriages...if you happened to cheat or start having feelings for another during one of the lows, you just feel worse about your marriage. If the affair is just a symptom, how is it that some caught cheating immediately declare their remorse and undying love, while others try to come back to the marriage (which supposedly was the worst thing ever) when the affair implodes? In my opinion, it is highly unusual to have success as long as OP is in the picture.
You cannot be lonely if you like the person you're alone with. Dr. Wayne Dyer
