I think it's bad because you can't do anything about what you find. Confronting her about it will make you look bad (i.e. untrustworthy) and will only make her angry and push her away. Also, it gives your PMA a huge hit and makes you less determined to do the needed work to win your S back, as well as makes you less likely to follow the strategies and techniques outlined in DR.
Do be embarrassed, but know that you're not alone. Many people here have done the same thing, and almost always admit when they do. Admitting this is a GOOD thing, MN Man, and resolving to not do it in the future is an even BETTER thing. Can you do that?
