Friendship, as understood here, is a distinctively personal relationship that is grounded in a concern on the part of each friend for the welfare of the other, for the other's sake, and that involves some degree of intimacy. As such, friendship is undoubtedly central to our lives, in part because the special concern we have for our friends must have a place within a broader set of concerns, including moral concerns, and in part because our friends can help shape who we are as persons. Given this centrality, important questions arise concerning the justification of friendship and, in this context, whether it is permissible to “trade up” when someone new comes along, as well as concerning the possibility of reconciling the demands of friendship with the demands of morality in cases in which the two seem to conflict.

Why i decide talking about this now... is because i encountered a situation where the 'friendship' was sort of destroyed by 'love'. Can't elaborate much on that...but this is what i found somewhere which i'd like to share with you...

For Aristotle, there are three kinds of friendship based on three kinds of affection that unite people. First, in a friendship of utility, the affection is based on the benefit or use the friends derive from the relationship. Each person gets something out of the friendship that is to his advantage, and the mutual benefit of the relationship is what unites the two people.

Second, in a pleasant friendship the basis of affection is the pleasure one gets out of the relationship. One sees the friend as a cause of some pleasure for himself. This friendship is primarily about “having fun together.” The friends may listen to the same music, play the same sport, enjoy the same form of exercise, live in the same dormitory, or like to hang out at the same nightclub. The two people may sincerely care about each other and wish each other well in life, but what unites them as friends is primarily the pleasure or “good times” they experience together.

For Aristotle, the third form of friendship is friendship in the fullest sense. It can be called virtuous friendship because the two friends are united not in self-interest, but in the pursuit of a common goal: “the good life,” the moral life that is found in virtue. The problem with useful and pleasant friendships is that the emphasis is on what I get out of the relationship. However, in the virtuous friendship, the two friends are committed to pursuing something outside themselves, something that goes beyond their selfinterests. And it is this higher good that unites them in friendship. Striving side-by-side toward the good life and encouraging one another in the virtues, the true friend is primarily concerned not with what he gets out of the friendship, but with what is best for his friend and with pursuing the virtuous life with his friend.

So...which is yours ?