There is no doubt that someone at a given time in your life did something bad to you. Almost everyone on this planet has been hurt, has been cheated, betrayed, abused, disregarded etc. What hurts most is that the person you least expect to do that is the one who does it!
But don't lay in self pity: you don't have to curl in self denial because of the past. You have to get over it. You have to move on. You have to move forward. Forgiveness takes courage. The weak cannot forgive. Forgiveness