Living in a perpetual state of anger feels terrible, which means it takes discipline. Never make up with your enemies before you die. You have something to prove. You have everything to prove! Don’t be fooled by the guilty party’s seemingly carefree and happy life. They’re dying inside and they will never recover without your peace offering. Stay mad forever.
Before you die, make sure that you have accumulated as many bygones as humanly possible within the constraints of the law. Do not kill people. Do make them feel incredible, burdensome guilt over not responding to you.