All bad experience give us a learning. Most of them tell us about how mean, coward and betrayer the human being can be. If we have only honest people in this world.. but it is a dream. Doesnt match with the human nature that is so imperfect.
Human being are the only one animal in nature that kills for pleasure. And there are many ways of killing someone.
Never give a second chance to anyone to put you down. Betrayal: Tolerance ZERO! Is the only way to survive in this stone jungle.