There are all kinds of reasons to keep secrets. People keep secrets out of shame, fear of ridicule, or for monetary gains. But perhaps most often, people keep secrets in order to protect a relationship—romantic, friendship, family, or otherwise. Because certain painful truths have a way of driving people apart.
1.) From Miroudias:
I know someone that continuously cheats on his wife and she does not know. One of their almost daily visit friends is his friend, a Russian "bombshell" he's known for years and has convinced his wife that they always were and always will be... Friends. What she doesn't know is how much sex they have.
Turns out, everyone is cheating. And everyone knows, except for the person being cheated on (and also me)???
2.) From RevengeOfKingDiccolo: