"the good person must be a self-lover, since he will both help himself and benefit others by performing fine actions. But the vicious person must not love himself, since he will harm both himself and his neighbours by following his base feelings." (1169a12–15)
Aristotle also holds, though, that, as Hughes puts it: "[t]he only ultimately justifiable reason for doing anything is that acting in that way will contribute to a fulfilled life."[6] Thus acts of philia might seem to be essentially egoistic, performed apparently to help others, but in fact intended to increase the agent's happiness. This, however, confuses the nature of the action with its motivation; the good person doesn't perform an action to help a friend because it will give her fulfillment; she performs it in order to help the friend, and in performing it makes both her friend and herself happy. The action is thus good both in itself and for the effect it has on the agent's happiness.

http://en.wikipedia.org/wiki/Philia