Sometimes people do some things that are unjust. Many receivers of misdeeds hold on to their anger and wait for an opportunity to get even.
The unfortunate problem is that the victims while no longer being victimized by the offenders are now victimized by the toxicity of their own thoughts and those toxins are gradually draining the joy and energy out of their life.
Forgiveness is an easy goal to set but it takes a concentrated effort to get there. Setting the Goal is step one.