There are ways to learn about this and do it...

• Forgiving others (Ensign magazine article, February 2019)
  

  "We are not always rewarded for our forgiveness the way David was. And we should not 
  expect it. Nor should we expect the offending person to repent first. President 
  Spencer W. Kimball (1895-1985) explained, "To be in the right we must forgive, and 
  we must do so without regard to whether or not our antagonist repents, or how 
  sincere is his transformation, or whether or not he asks our forgiveness."3 Even 
  for repeat offenses, we are commanded to forgive "until seventy times seven" 
  (Matthew 18:22). [Spencer W. Kimball, The Miracle of Forgiveness (1969), 283.]
  "

• The 12-step program, which can be found under the next link, also has some good, helpful info on forgiving and forgiveness.
• MANY RESOURCES: search by topics, at www.churchofjesuschrist.org (magnifying glass icon): includes a very good 12-step program, & much, much more. (main)
• And ask the missionaries: "They can help you! "
• How I learned God is real & cares (and you can too), and I find that extremely helpful in life: many long-considered reasons for peace and motivation, even...
• There are some helpful problem-solving resources for marriages and families.
• (Suggestions/questions welcome! More information is planned or available on request. Page footer has contact info.)