Even Puppy would say not to snoop until you are ready to know the answer. Until you are really ready to deal with what you might find out, I believe it is better not to snoop. Don't snoop just because you are curious. Only do it if you really want to know, and have a plan for how you will react. You want to be in control of yourself when you react, if you haven't thought it through ahead of time, your emotions will get the best of you.
