"an unmarried young woman becomes the temporary best friend of another young woman who is married"

Pauline and Ernest Hemingway, 1927
Public DomainPauline and Ernest Hemingway, 1927 - Credit: Ernest Hemingway Photograph Collection
The woman in question is, of course, Pauline Pfeiffer, who became Hemingway's second wife. Hailing from a wealthy background, Pauline married Hemingway in 1927 and gave him two sons, Patrick and Gregory.

The couple divorced in 1940.

Ernest and Pauline Hemingway, 1927
Public DomainErnest and Pauline Hemingway, 1927 - Credit: Ernest Hemingway Photograph Collection