THe two B 's

Why is it so that sum body simply walks into ur life n without u realising leaves .......makin one wish .wat ever went wrong ???why do people show that they are ur best friends and would stay with u even in a do or die situation ....and then wish you never walked the face of this planet ...why is this world full of friends waiting to ditch you at the nearest opportunity .Why is it that people play with your sentiments ..and then they don realise ......
Is only Backstabbing and Betrayal left in this world ???