Secrets

I really dont understand why someone who has been told a secret tells the secret to someone else. What dont you get about the meaning of the word, secret? It means you are not suppose to tell anyone else about it. Ever. And then that said person wonders why they have had countless arguments, and needless drama with the people that have confided in them. They wonder why it comes back to them and bites them in the ass.
And I absolutely cant stand when I confess a secret to someone and they immediately tell someone else. And then that someone else tells another. Its a vicious circle. It just keeps going and going and never stops. Nothing good ever comes of it. All that comes of it is lies, misunderstandings, and hurt. Just when I start trusting someone they have to go and ruin it for not only themselves but also for the next batch of people I meet. Why can't people learn to just shut up sometimes?!