Jesus commands us to go to a brother who has sinned against us and present his sin to him. But in Egypt, Joseph didn't do this, and yet he successfully resolved the conflict with his brothers. Just as you can choose to forgive another Christian, you can choose whether or not he has sinned against you. Joseph chose that God had used his brothers' evil actions for a greater good, and therefor, they had not sinned against him.
I was teaching at a successful Christian school when they got a new principal. On the first day of school, the principal informed the students that the teachers had been mistreating them, but he would put a stop to it. He assured them that although the teachers were their enemies, he was their friend. He proceeded to devastate the school, fired me unjustly so he could give his incompetent son a job, destroyed the excellent teaching staff, and finally quit in failure. He went overseas to a Christian school and failed there.
After a rough couple of years, I got a high-paying job at a paper mill. Twelve years after being fired, I learned that the teachers' miserly salaries had been increased 4% since I had left. I would have had to quit anyway. Fifteen years after being fired, I retired to Mexico at the age of 52, and God has blessed my wife and I ever since.
I found several of my former students on Facebook, and they were glad to hear from me. They are doing well, and God has used the efforts of the Godly teaching staff in their lives. Do I need to accuse the principal of sinning against me?
I found him on Facebook, laughed, and went on my way.