"He who forgives ends the argument."~ African Proverb
It doesn't matter who started the fight. Both sides can benefit from the healing power of forgiveness. Be the first to start the forgiveness process. It doesn't take anything away from you.
Try the Hawaiian therapist, Dr. Hew Len's forgiveness method called ”Ho'oponopono” by telling your feuding partner, "I love you, I am sorry, please forgive me."