This is just something I am dying to ask out of curiosity, because I am not married. Are most married people this aware of each other's emails, facebooks, etc? I recently ended a 4 year dating relationship that never reached engagement. We lived in separate places. He was EXTREMELY intensely focused on reading all of my files on my computer, skype convos, chat friends lists, etc when he visited. We would fight over random things I said to family members. We fought when I added a guy to facebook that immed and said he knew my pastor and asked about my church. I found myself having to 'prove my innocence' or explain why I added someone. I ended up feeling accused and constantly on trial.
Only I think my case was different because he didnt propose to me and we weren't getting married so I think that level of access was unwarranted. But if we did get married, would this be normal? I think you are absolutely one hundred percent justified in being uncomfortable with this lady, just wondering if this is typical to be that aware of these details.
Maybe he feels he had pure intentions and feels you doubted him? If so, explain that you think SHE is the one acting like she doesn't have the purest intentions, and assure him that as another woman you might have more insight to what women are thinking than he does. Even though my situation wasn't the same, I can tell you it didn't feel good.
Other married people, just so I know in the future, at what point is it normal for your 'other' to be this into your private messages?