Nancy Freeman-Mitford CBE (28 November 1904 – 30 June 1973), known as Nancy Mitford,[n 1] was an English novelist, biographer and journalist. One of the renowned Mitford sisters and one of the "Bright Young People" on the London social scene in the inter-war years, she is best remembered for her novels about upper-class life in England and France and for her sharp and often provocative wit. She also established a reputation for herself as a writer of popular historical biographies.Read about Nancy Mitford in Wikipedia
The trouble is that people seem to expect happiness in life. I can't imagine why; but they do. They are unhappy before they marry, and they imagine to themselves that the reason of their unhappiness will be removed when they are married. When it isn't they blame the other person, which is clearly absurd. I believe that is what generally starts the trouble.