As adults, our social connections are frequently relationships of convenience. Rather than being based solely on personal choice, they are very often based more on circumstance--or even happenstance. When our personal circumstances change, the conditions of our friendships can also change, leading us to a point where a reconsideration of exactly where we're putting our energies may well serve us.
One important aspect of living authentically is living in truth. From the standpoint of relationship, this means not living in state of denial about the conditions that surround a relationship. It also means not passively accepting the negative aspects of the overall circumstances that surround us. With regard to friendships in particular it means not holding space for those aspects of others' personalities and social comportment that are either toxic to us directly, or just negativity that we would be better served to avoid.
Relationships of convenience, by virtue of their very nature, often prompt us to give just that sort of latitude to the social frailties and personal foibles of others. Extending that latitude can, however, cause us to unwittingly compromise ourselves. Taking the time to examine our friendships--and sorting out the synergies between our experience of another person and our own value set--is key to living in a way that is both authentic and evolutionary.