Questions: Relationships

It can be anything from using someone for pity, cheating on a partner or with your best friend's partner, lying about a major portion of your life, a husband dying in old age and never finding out one of this children isn't his, etc.

I was just reading here about a woman that cheated with her friend's boyfriend. The friend never finds out, marries another man, already has older kids and the cheater dies years later in an accient. The cheating boyfriend from her younger years literally took that to his grave. The so called ''friend'' is still in the woman's life, never confessed and likely never will.

Among the liars, users, fakes or cheaters (though some can be remorseful but usually when caught suddenly many are sorry) that are caught and exposed but how people that do that are never caught and they can even take that to their grave?