I'm going to break up with my fiancee over something I found while snooping
Do you think that is fair to her to keep it a secret?
No it wasn't. It was a nude picture of her with a guy from a party and she shouldn't have it still.
I think it is terrible that you did something like that. It is wrong to snoop on your significant other. You should tell each other your secrets before you get married.
She's just going to get mad anyway and won't listen to me when I breakup with her.
It might not matter now but in the future it is not good to snoop on your partner. If you don't find anything, your partner will be upset about you doing it and will break up with you.