friendship

"Friendship is a relationship of mutual affection between two or more people. Friendship is a stronger form of interpersonal bond than an association. Friendship has been studied in academic fields such as sociology, social psychology, anthropology, and philosophy." - Wikipedia

In Diderot's Encyclopedie,  his definition offers an early modern conception of good friendship in the 18th century. He writes:

"Friendship is nothing other than the practice of maintaining a decent and pleasant commerce with someone. Is friendship no more than that? Friendship , it will be said, is not limited to those terms; it goes beyond those narrow boundaries. But those who make this observation do not consider that two people do not, without being friends, maintain a connection that has nothing incorrect about it and that gives them reciprocal pleasure. The commerce that we may have with men involves either the mind or the heart. The pure commerce of the mind is called acquaintance; the commerce in which the heart takes an interest because of the pleasure it derives from it is friendship. I see no idea more accurate and more suitable for explaining all that friendship is in itself and likewise all its properties." 

The qualities that make up a good friendship have changed over time. Presently, friendship has two dimensions: quality and conflict (Demir, 2007). The quality of friendship is important for a person's well-being. High quality friendships have good ways of resolving conflict, ultimately leading to stronger and healthier relationships. Good friendship has been called "life enhancing" (Helm, 2012). Engaging in activities with friends intensifies pleasure and happiness. The quality of friendships relates to happiness because friendship "provides a context where basic needs are satisfied" (Demir, 2010). Quality friendships lead an individual to feel more comfortable with his or her personal identity. Higher friendship quality directly contributes to self-esteem, self-confidence, and social development (Berndt, 2002).

Friendship at some point in time become eroded by misunderstanding and conflicts. But no matter  what dispute friends encounter at times, should not be the reason to injure the friendship and put friends apart.