" I miss being a mistress. I enjoyed it. I loved it, in fact. I never felt guilty. I pretended I did. I had to, with my married girlfriends, the ones who live in terror of the pert au pair or the pretty, funny girl in the office who can talk about football and spends half her life in the gym. I had to tell them that of course I felt terrible about it, of course I felt bad for his wife, I never meant for any of this to happen, we fell in love, what could we do? "

― Paula Hawkins , The Girl on the Train