It's a fact in friendships . You develop a friendship with someone, and conflict is sure to occur. Many superficial friendships end up being shelved after an argument because there isn't enough depth to warrant all the trouble it takes to smooth over the disagreement. Unfortunately, even when the friendship reaches a deeper level, conflict continues to happen and can break apart a relationship. From my experience, people begin to talk about what happened even sooner afterwards.
People begin to pick sides.
The gossip circulates and all of a sudden, friends become enemies. Suddenly everyone is mad at everyone else. So, be sure to talk with the person with whom you are upset without the interference of people who aren't really involved. Resolve it the day it happens. One rule my parents follow in their marriage is that they don't go to bed angry with each other.