"before the war he'd proposed to Unity Mitford"

Unity Valkyrie Mitford (1914-1948) was a member of the aristocratic Mitford family, which traces its origins back to the 11th century.  Her sister Diana was married to Oswald Mosley, leader of the British Union of Fascists. 

Unity and Diana Mitford travelled to Germany as part of the British Union of Fascists delegation in 1933.  They stayed on in Germany, and became prominent and public supporters of Nazism and fascism.  Unity was part of Hitler’s inner circle of friends and confidants from 1936.

At the outbreak of war in 1939, Diana returned to England, where she was arrested and imprisoned.  Unity remained in Germany, and attempted suicide by shooting herself in the head.  Although she survived, the bullet could not be removed, and she never fully recovered.  She died several years later as a result of meningitis caused by cerebral swelling around the bullet.