P.S.: What I Didn’t Say with On Exes and Thin Mints by Margaret Littman: From BFFs to frenemies, from The One Who Got Away to The One You Wish Would Go Away, P.S.: What I Didn’t Say covers all areas of female friendships. Margaret’s essay, “On Exes and Thin Mints,” appears in this anthology. Read more on the book’s blog.