...I think there is a big difference between privacy and secrecy...
...IMHO the lack of trust does as much damage, if not more, to a relationship than any "secrets" you might uncover...
I wish I could get this fundamental difference across to my other half. Any time I forget to log out of my hotmail, he digs through my massive and never cleared out inbox reading stuff from years before we met and getting all pissy about guys I used to know - mostly just friends, not exes. I don't think he actually suspects me of anything, he's just insecure and a nosey so-and-so. He thinks I'm furtive and secretive, I think he's ludicrous. Meanwhile he looks up old girlfriends on Facebook and messages them asking how they're getting on, which I don't mind in the slightest as I know - again - he's just being incorrigibly nosey, but what I despise is the double standards being employed.
I've checked up on guys a couple of times in the past, only to confirm strong suspicions that they were up to no good. I've never been wrong. I'm not an insecure person in general and I'm not prone to snooping for no reason.