You don't have to do anything because KARMA IS KARMA

   You have every right to be disappointed in what they have done, it's human nature.

  You have every right to be angry that they did it, that is human nature.

  You just have to not let what they did make you REGRET how you REACTED to what they have done. 

  It is not the circumstances that you have to face that will determine the OUTCOME it is how you REACT to the circumstances that you must face.

 Just keep in mind that KARMA IS KARMA and eventually it will bite them. 

  When you have to walk away from someone because they are NEGATIVE it's a POSITIVE thing.

  Remember that they are who they are and you can't CHANGE WHO they are. But you need to GET AWAY from them before they CHANGE WHO YOU ARE, PERIOD.

  It may be hard to walk away from them. But because misery loves company you have to so they can't drag you down with them. 

   Don't hurt yourself trying to pay them back for what they have done, just do the right thing and let KARMA take care of them.