From The Friendship Factor – How to Get Closer to the People You Care For by Alan Loy McGinnis:

What did St. Paul mean in his great hymn to love when he wrote, “love does not keep a record of wrongs” (1 Cor. 13:5 TEV)? I think he meant that to love we must be able to believe that people’s characters do alter, that the leopard can change its spots, that conversions do occur, that people do repent, and that at times they do change. To put it another way, he was urging that when we are in relationships of long standing we must live in the present, forgetting some of the slights we’ve endured in the past. For sooner or later, in any friendship, someone will be wronged. In a weak moment, the beloved will severely criticize or embarrass, or temporarily walk away. If we allow ourselves to dwell on those misdeeds, the relationship is doomed. Keeping close books on how many wrongs have been done us makes us accusatory. It is curious what a short memory we have for our own mistakes, and what a long one we have for the mistakes of others.