“Not So Deep As a Well: Collected Poems” by Dorothy Parker:

The Leal

 The friends I made have slipped and strayed,
   And who’s the one that cares?
A trifling lot and best forgot —
   And that’s my tale, and theirs.

 
Then if my friendships break and bend,
   There’s little need to cry
The while I know that every foe
   Is faithful till I die.

Source: GroundReport.com