It is better to leave it to Karma and to the balance of the Universe if someone has wronged you. If you keep holding onto it, you are continuing the sorrow, the hurt, and the problem takes over your life. It is much kinder to yourself to let it go. It is not up to you to be the judge, the jury and the executioner. Other forces of the universe are at work to put things to right. Let them do their job and just live in peace.
There will always be people who are cruel and hurtful based on their insecurities and evil intent. You don’t need to add to the world’s burden of distress. The evil can stop with you. And in that way you will build yourself up to be strong and able to handle life’s misfortunes without thinking you have to set. everything right. It is not up to you. Just be free and know that no one gets away with anything in a perfect Universe.