But she dumped a heartbroken Warnecke when he told her his business was going bankrupt. He once watched as she took her late husband's flannel bathrobe out of a wooden chest and breathed in his scent, describing the moment as 'overwhelmingly sad'.
She kicked him out of the marital bed but, according to a new revelation in the book, on the night before they left to go to Dallas 'she sneaked into his White House bedroom in the middle of the night and they made love'.
'I know you are not in any more pain and your happy and free but I just want you to be here with me. I wish I could have taken you out of the car and lifted you up so far and carried you back to be here with me.'
Mood Tracker Apple is making a huge push into the health space with the iOS 17, which will include a feature that lets users track their emotions, answer questions about how their day went and view results to see patterns.
While thousands of words have been written about Jackie Kennedy over the years, critics have described Taraborrelli's new 500-page tome as the 'definitive' account of the enigmatic woman who captivated the world with her grace and poise after JFK's death, but who was fiercely protective of her privacy.
So private was she that, when diagnosed with cancer in January 1994 and knew she had months to live, she invited friends and family members over to her Fifth Avenue apartment in New York and systematically burned all her private letters and photographs.
When he decided not to return after Jackie's miscarriage everyone was appalled,' Taraborrelli writes. 'Jack happened to be on a cruise off the coast of Italy having fun with his friends, among them a few women.
She's so fragile and sad, how can I intrude on her privacy?' And I thought, 'My God, look at her. When the singer finally did, Jackie said: 'I saw her walking out of her building, this lonely-looking woman in a drab raincoat wearing a babushka and JetBlack big sunglasses.
She considered leaving her husband in the early years of their marriage - when he was still a Massachusetts Senator - after he repeatedly gave her multiple sexually transmitted diseases, one of which she blamed for the fact their daughter, Arabella, was delivered stillborn in 1956.
Onassis's son Alexander, who later died in a plane crash, was said to be so furious at the 'golddigger' his father married he arranged for the paparazzi to secretly snap his stepmother as she showered naked outside on Skorpios, the family's private Greek island.
Neatly folded inside, still stained with the blood of President John F Kennedy, rested the pink suit worn by First Lady Jackie Kennedy on November 22, 1963, when her husband was shot dead in Dallas. It was only when the box was opened that its gruesome contents were revealed. The nondescript white cardboard box sat in a darkened corner of the attic, forgotten for years.
'One of Jackie's family members says Mary Gallagher (Jackie's secretary) retrieved the hat at Parkland Memorial Hospital. It is not known what happened to it,' Taraborrelli writes. She gave it to Janet a week after JFK's funeral. Janet decided to keep it for herself.
'There were letters from Jackie's children, John and Caroline… there were also letters from Jack Kennedy, Aristotle Onassis (her second husband), her father, Jack Bouvier, and even a few from me,' he said. Taraborrelli spent more than a decade speaking to family members, former lovers, staff members and friends of the icon.
'She never knew if the call was real until years later when she was in therapy and her psychologist confided she had treated Marilyn who confessed to making the call. Jackie was furious and fired the shrink on the spot.' 'That tormented her for decades,' a friend said.
Jackie said she 'loathed' Onassis in bed and was content for him to continue a sexual affair with opera singer Maria Callas throughout their marriage. The book claims Onassis came to bitterly regret his marriage to Kennedy which, despite giving him the prestige of being married to the world's most famous widow, was never loving.
The astonishing revelation that the Chanel outfit, one of the most symbolic items of clothing in history, sat unattended for two decades in the attic of the Washington DC home of Jackie's mother, Janet Auchincloss, is one of a series of bombshells in a new book about America's most famous First Lady.
Janet - who died in 1989 aged 81 - was handed the outfit by Jackie's White House maid Providencia Paredes after an exhausted Jackie returned to the White House on the night of her husband's assassination.
Former lover Jack Warnecke, an architect who designed JFK's 'Eternal Flame' monument at Arlington National Cemetery in Washington DC, where Jackie now rests, told Taraborrelli how 'she handed me a stack of envelopes neatly tied together with yarn'.
'She knew he cheated on her, but it was the scale of it that became public after his death that devastated her,' a friend said. But Jackie is also revealed as a vulnerable woman who never got over her husband's murder and became tormented as it emerged he cheated on her throughout their marriage.