I had this to say about it in my book FINDING TRUE FRIENDS - for Friendship to work you have to really want in Nick Founder nickfounder.com
In Corvette, Barbara, Conflict Management – A practical Guide to Developing Negotiation Strategies, (2007) Prentice Hall, the authors discuss the different conflict patterns being: avoidance; acceptance and appreciation; and engagement and development. Corvette observes that with avoidance, the friends seek to avoid conflict on the bases that they will lead to anger and hurt and are best avoided. She goes on to say that with acceptance and appreciation, the friends air their concerns but don’t really engage in any real discussion or debate for fear of conflict and at best they agree to disagree. In engagement and development there is honesty in communication and an exploration of each of the friend’s perspectives. Differences are aired and the friends learn about each other. Corvette concludes “But for those who both possess the skills for engaging in conflicts and value the process itself, conflicts within friendships may more likely be explored and ultimately experienced as facilitative of individual and relationship development.”