This week marks what would have been the 100th birthday of the late President John F Kennedy, who was tragically assassinated just over 1000 days into his first term in 1963.
For years there have been rumours of his affairs, most famously with the actress Marilyn Monroe.
Now speaking exclusively with Express.co.uk, Christopher Andersen – the bestselling author of These Few Precious Days: The Final Year of Jack and Jackie – has revealed the truth of what happened and how it impacted the First Lady, Jackie Kennedy.
The Kennedy expert, speaking in promotion of Jackie’s release on DVD and Blu-ray, said: “Starting in the 1980s I interviewed all of the President’s cabinet, his advisors and friends.
“One or two claimed they didn’t know, but most of them knew the President was a serial womaniser and was doing some very reckless things.
“And Jackie knew. It’s an absurd thing, this notion that she wasn’t aware. It wasn’t a cynical arrangement though. She did love him, I’m quite certain.
“She was wounded by what she thought was a kind of disease inherited from his father.”
He continued: “One of their good friends told me that they were the two most alone people he’d ever known.
“Jackie was very uncomfortable being First Lady. She didn’t like being called it because it sounded like a saddle horse.
“She tried to dodge the job whenever she could, avoiding lunches.
“Jackie did worry about Marilyn Monroe, because Marilyn Monroe was a lose cannon.
“There was no telling what she would do or say. When Marilyn sung Happy Birthday Mr President in Madison Square Garden for Jack’s 45th birthday, Jackie was out of town with a horse show.”
Andersen added: “Marilyn thought he would divorce Jackie and marry her. But after Jack sort of cut her off, she turned to Bobby. But Jack was the big affair and that went on for a number of years.
“Jackie was often out of the White House and Marilyn was…