Each and every one of us should forgive all who transgress us. Not only will your life improve ten folds, but you can start living anew without pain and grudges. If you want to enjoy life to the fullest, then you have no choice, but to let go. It still doesn’t mean you should accept nor forget their sins.
When you don’t forgive someone or something; it is like having many small irritating things occur on a daily basis. This adds up, and over time becomes this massive, (insert your personal cuss word) that rips you from the inside out.