Significant others that snoop (dogg)

What are your feelings about about significant others that snoop through your private belongings or journals? I get the feeling that most people would disapprove and say that it's wrong to do, but how many people are guilty of this themselves?

My boyfriend and I have both done it to eachother (we read eachother's private journals once), although I'm getting the feeling that he's continually doing things like checking my emails, private messages, facebook, etc. when I'm not around. Yes, it upsets me because he says he has issues with trusting me at times, but he never finds anything because there's nothing to find. Is he looking for something just to try to prove himself right?
Maybe it's because he's Mexican

Do you have spouses/partners that snoop, or have you had ones in the past?

Jam it back in, in the dark.