like some of you said its a personal thing....I have my pwd she has hers I sometime will ask her pwd to fix an issue or sth like that but dont really care to remember....

Why would you want to reply to her emails and fb?  If she is capable of having them let her deal with it.  I feel people should have their own space....youre not a father/mother to a 7 yr old. unless you feel your partner is so incapable that you need to do it for her.

I am ok with leaving your spouse or gf  alone - if they wanna cheat pwd woudl be last on the list...