"He who covers over an offense promotes love, but whoever repeats the matter separates close friends." -- Proverbs 17:9 

I put a screwdriver through my hand years ago. Since the injury was located between the thumb and index finger I was constantly reopening the wound from activity. As a result what should have cleared up in a week or so took months. Reopening a wound always slows down the healing process.

Offended hearts are much the same as wounded hands. Once the offense is dealt with, it needs to be covered over with love and forgiveness. Time will bring the desired healing. On the other hand, if we choose to repeat the incident we reopen the wound and healing will separate close friends.

What good does it do to harp on the wrong done to you? Does it really contribute to healing? Do you feel better after you revisit the situation with your friend or do you feel more grieved? To forgive and forget promotes the love that heals. Value your friendships and whenever you are offended, deal with it and let it go. Time will bring the desired healing.