A relationship in which neither friend is able to forgive the other does not have a very long shelf life. It is inevitable that there will be misunderstandings in a relationship. We cannot see inside each other's minds to be able to know that they never intended any harm. Everyone has buttons that can pushed that the other friend may unknowingly push. However, when a sincere apology comes your way, you need to be able to forgive the other person. This involves trusting that the other person truly didn't mean any harm and wants to heals the rift between the two of you.