Bad things are going to happen in your life, people will hurt you, disrespect you, play with your feelings.
But you shouldn't use that as an excuse to fail to go on and to hurt the whole world. You will end up hurting yourself and wasting your precious time.
Don't always think of revenging, just let things go and move on with your life.
Remember everything happens for a reason and when one door closes, the other opens for you with new blessings and love.