I have been deeply hurt in my life. Betrayed, ridiculed, bullied, slandered, abused. For a time I carried past pain into each new day. It was so exhausting. One day I just could not carry the anger bags any longer. I set them down by making a list of everyone and everything that hurt me. Then I forgave. Regardless what other people did to me it was the act of my forgiving them that set me free.
Focusing on how you have been wronged does not allow you to appreciate how much better you can be for having been through the experience. It is the hard lessons in life that give you the opportunity to learn the skills necessary to avoid the same or similar hard problems in the future.
No matter if it is a job, relationship, interaction with a child or parent, or just an encounter with a driver it pays to pay attention to what life is asking you to learn from the experience. Sometimes that is learning how to forgive so you can move on.