I would go as far as to say that you shouldn't be in a relationship under these conditions. I loved the way Sour Girl and Neon put it. What's really important here: that someone who isn't trust worthy is allowed his privacy or that a party in a committed relationship feels safe, loved and important enough to be honest about what she has done and how she feels without the relationship ending?
Sour Girl and I think exactly alike. It's eerie.