What Should I Do??

Hiam.. What should I do sia.. Because my friend back stab me, I back stab somebody. Then now the person back stab me. I don't know what to do sia.. Hiam.. If I know this will happen I sure will not choose to tell my friend de lor.. My friend can even lie to me sia.. I feel very disappointed. I should follow his so-called 'Jie jie'. I should not waste my energy to be angry with him.