One doesn't know, till one is a bit at odds with the world, how much one's friends who believe in one rather generously, mean to one. ~D.H. Lawrence
Its not rare to find that the world is full of fake relationships and so-called-friends who back stab you with a dagger you have given them for their safety purposes. You will eventually figure out and develop a sensor to detect friends and so-called-friends as time goes by. Sometimes you may not have a choice and may have to associate with people whom you know are not genuine.
As time passes I have developed my censoring very well and I smell confident tricksters from miles. It's highly dissapointing that they break the trust you had for them and specially when you are someone who lives by the rule of appreciating the good facts of people who are even stereotyped to be evil and bad.
Life is a never ending lesson and with time and with every deed we learn. Sometimes forgiveness is the best comeback that you could have for those who ill treat you.