Don't let anyone bring you down so low as to hate them. Release them from the hold they have on you and continue on with peace in your heart. Life is short and is not worth wasting your time trying to figure people out or prove anything to them. The only person you have to prove anything to is yourself. Strive to be the best person you can possibly be, be strong, and walk away. Holding on to bitterness and anger will only hinder your happiness. Your life is much too precious to spend another minute worrying about someone that doesn't bring you happiness. Say goodbye and wish them well. After all, they've made you a stronger person. They'll see the light someday.