While at Camp Sheridan, Fitzgerald met Zelda Sayre (1900-1948), the "top girl," in Fitzgerald's words, of Montgomery, Alabama, youth society. The two were engaged in 1919 and Fitzgerald moved into an apartment at 200 Claremont Avenue in New York City to try to lay a foundation for his life with Zelda. Working at an advertising firm and writing short stories, Fitzgerald was unable to convince Zelda that he would be able to support her. She broke off the engagement and Fitzgerald returned to his parents' house in St. Paul to revise The Romantic Egotist. Recast as This Side of Paradise, it was accepted by Scribner's in the fall of 1919, and Zelda and Scott resumed their engagement. It was published on March 26, 1920, and became one of the most popular books of the year, defining the flapper generation. The next week, Scott and Zelda were married in New York's St. Patrick's Cathedral. Their daughter and only child, Frances Scott "Scottie" Fitzgerald, was born on October 26, 1921.
Although Fitzgerald's passion lay in writing novels, they never sold well enough to support the opulent lifestyle that he and Zelda adopted as New York celebrities. To support this lifestyle, he turned to writing short stories for such magazines as the Saturday Evening Post, Collier's Magazine, and Esquire magazine, and sold movie rights of his stories and novels to Hollywood studios. He was constantly in financial trouble and often required loans from his literary agent, Harold Ober, and his editor at Scribner's, Maxwell Perkins.
The 1920s proved the most influential decade of Fitzgerald's development. His second novel, The Beautiful and Damned, published in 1922, represents an impressive development over the comparatively immature This Side of Paradise. The Great Gatsby, which many consider his masterpiece, was published in 1925. Fitzgerald made several famous excursions to Europe, notably Paris and the French Riviera during the 20s, and became friends with many members of the American expatriate community in Paris, notably Ernest Hemingway.
Fitzgerald began working on his fourth novel during the late 1920s but was sidetracked by financial difficulties that necessitated his writing commercial short stories, and the schizophrenia that struck Zelda Sayre Fitzgerald in 1930. Her emotional health remained fragile for the rest of her life. In 1932, she was hospitalized in Baltimore, Maryland, and Scott rented the "La Paix" estate in the suburb of Towson to work on his book, which had become the story of the rise and fall of Dick Diver, a promising young psychoanalyst and his wife, Nicole, who is also one of his patients. It was published in 1934 as Tender Is the Night. Critics regard it as one of Fitzgerald's finest works.
One overriding moral message in the novel is that living recklessly and excessively leads to personal decline and destruction. The consequences extend beyond the individual and affect others, as well, such as when Abe's excessive drinking causes the imprisonment of one innocent man and the death of another. Dick's excessive drinking also has dire consequences, such as alienating his friends, ruining his career, and getting him beaten and imprisoned. His obsessive interest in youth and beauty contributes to the destruction of his marriage, paints him as a sexual pervert, and eventually entangles him in a lawsuit. 
