When people are in serious relationships, the rules for whether they can or should share their friends' secrets [1] are complicated. In one way it seems completely natural, but then again, a secret is a secret, right? If a good friend is in a serious relationship, and I tell her a secret, I assume she’ll tell her significant other — whether she actually does, I don’t know, but I always make that assumption. If it's something that I don't want him to know, then I don't tell her.

But I realize the rules on this differ from person to person. So tell me, if you tell a friend something, do you assume she’ll tell her significant other? And for those of you in a relationship, do you spill the beans to yours? What should the protocol be when it comes to sharing secrets with your significant other?

Source [2]