Zew is absolutely right. Pls save that for later. Telling her that now might irritate her and even get her closer to OM. Continue to work on you and try to ignore the affair. OM is the symptom and the cure is left for you to work on you. We all play some kind of role in this bad behavior. Think deep and fix whatever need to be fix when it comes to you. Your attention now should be you and not the affair.