When my h and I got together, neither of us talk about our past relationships. It was later, when we started having problems, I opened up about my past as it was relevant to my issues, and so did he. I don't know if it helped or hurt and I wish I hadn't tarnished our relationship by being so transparent, honestly.

I always trusted his fidelity and didn't snoop about that. But, if I had suspicions, sure I would ask him, but I'm sure he would lie, as all cheaters do, and you bet I would snoop. Then, if I felt really insecure and sure he was cheating, I would deal with it and most likely leave him. What's the difference between snooping and investigating? You need to protect yourself.