I am all in favor of snooping if you can handle what you find. Most can't, so that is why we strongly suggest not to snoop.
Originally Posted by JllyRgrs
Should let it go or ask her?
Do not reveal anything about what you know and how you found out. "We both know that is a lie." is a great way to deal with any deception. In this particular case, I would STFU.
During this stage of the process, you need to be completely focus on your personal growth and the positive changes to the way you want to interact with her (and more important everyone else).
Take this time and look deep into yourself and figure out what issues you have. There are some deep subconscious issues we all have to figure out and deal with and make changes. This is a good time to do that.