Yes! This especially is part of the reason I would want to know. I would be unbelievably hurt and betrayed to find out that my spouse not only cheated on me but then hid that fact from me and allowed us to live a lie for 10-20-30 years. And it doesn’t really matter whether or not I ever find out, it would still be a betrayal. I don’t care if the truth is more painful than reality, I still want the truth. I don’t want to be living in a make-believe world that someone else is keeping me in because they are afraid I will be hurt too badly by the real one. And, again OP, I am not saying this to try and convince you to tell your spouse because, for some reason that I can’t understand, there really are people who wouldn’t want to know. (Personally, I believe that the right thing to do, lying and decieving others is wrong, yes the truth will bring pain with it, but it is not the words themselves which cause the pain, but the reality behind the words which has already happened) But just please don’t take the advice that people are giving of not telling your spouse as obviously being the correct answer. Talk with someone in person about your situation.