^ Filth but that cracked me up.
On a more serious note... if it's her partner.. what's she hiding?
Hell, my girlfriend (all be it of 6 years )knows most of my passwords, it's convenient if ever she needs anything or I am away and need to ask her for something I can't access on my phone.
If she logged into my stuff... I have no idea why she ever would but if she did... good, she's interested in what i'm doing.
If she was doubting me or wondering where I am disappearing off to... good too, i'd rather her not worry. You would hope if she had a problem she'd tell me.
If you think your partner is "snooping" and that's a problem, by setting a trap you're doing something you're complaining against.
What are you going to say if they are.... "hey,.. you don't trust me... I found out because I set this trap because I don't trust you...".
Even worse if there is something to hide,... your argument would be... "hey, i've been doing something I shouldn't,.. then I set a trap on my computer and caught you because you don't trust me (rightfully as you did something)"
As bad as each other IMO.