I've NC for this. I've been seeing BF for about 6 months but, due to previous relationship traumas and personal issues, I'm very insecure sometimes and spend quite a lot of time thinking I'm not what he wants. I'm also quite nosey and don't like to think I'm missing out on something whilst he's quite a private person and doesn't tell me things because he thinks they are unimportant.
My problem is that I know the password for his email (I was chatting to him as he logged in and couldn't help but notice accidentally saw it). I keep telling myself that reading his emails to reassure myself that he isn't hiding things from me is a very bad thing to do but I need other people to also point out just how terrible this would be.