Since you say your marriage was turbulent perhaps your wife knows on some level that you weren't entirely faithful throughout the course of it. You have both received shocking and painful news and are now dedicated to making the best of what time you have left. I hope that will be some considerable amount, and since the affair is well and long over, I agree that in his delicate period of rapproachment, you don't want to spend it dealing with the fallout of a past affair.
This doesn't mean you never tell your wife, but it may be something you decide to do later. Perhaps there will be a time when you can say to her that rededicating yourself to your marriage has been the sweetest time of your life. That you want her to know what her love and support has meant to you, and that you are sorry you weren't always the husband you should have been. She might say, "It doesn't matter now, I don't even want to talk about the past." Or she might want to know what you mean, or you might feel the need to explain you feel guilty about the past and don't want it to shadow your present. But even if you tell her, being honest in this circumstance doesn't necessarily require you to reveal with whom or for how long. You can just explain you don't want her to ever thing that there was dishonesty in your last years together, but that she should know this time together has been real and true.



