Though the two conducted their affair clandestinely, de Gramont's husband found them out and attempted to stop them from seeing each other. He was unsuccessful, and he divorced de Gramont in 1920 after a period of separation. In 1918 she and Barney wrote up a marriage contract stating: "No one union shall be so strong as this union, nor another joining so tender—nor relationship so lasting". The relationship continued until de Gramont's death in 1954.
