Frank admitted, when questioned by Nancy, that he had been involved with another woman, but he insisted there would be no more and the pair got married.
Nancy Sinatra Sr., the first of Frank Sinatra's four wives and mother of his three children, has died.
But in September 1950 Nancy was granted a legal separation because of his mental cruelty and an affair with actress Ava Gardner, who he later married. He and Gardner divorced in 1957.
Born Nancy Barbato, Nancy Sinatra Sr met fellow New Jersey resident Frank Sinatra when they were teenagers and the couple married in 1939.
In December 1963, the Sinatras went through a scare when their 19-year-old son Frank Jr was kidnapped from a Lake Tahoe hotel and held for $240,000 ransom.
When his fame began to grow, the couple moved to Los Angeles where he became known as one of Hollywood's biggest stars.
After the gossip over the divorce and Gardner marriage died down, Nancy Sinatra devoted herself to family and numerous celebrity friends, largely withdrawing from the spotlight.
She outlived her husband, who died in 1998. The two had three children together, Nancy, Frank Sinatra Jr. and Tina Sinatra.
She also remained friendly with her ex-husband, who is said to have put in requests over the years for pasta and other Italian food dishes she was known to be an expert at preparing. Sinatra's hit song, "She's Funny That Way", plays in the background.