A new book by Christopher Andersen, ‘These Few Precious Days: The Final Year of Jack with Jackie,’ claims that Marilyn Monroe called Jackie Kennedy at the White House to confess her affair with President John F. Kennedy.

According to Andersen, Jackie “knew everything” about Jack’s cheating, but his relationship with Marilyn “seemed to bother her the most.”

In fact, Marilyn was convinced JFK was going to leave Jackie for her, according to her friend Jeanne Carmen.

“Marilyn, you’ll marry Jack, that’s great,” Jackie reportedly responded to Marilyn’s confession.

“And you’ll move into the White House and you’ll assume the responsibilities of first lady, and I’ll move out and you’ll have all the problems.”

Jackie had a complicated relationship with her husband’s infidelity. Jack’s close friend, George Smathers, said Jackie was “damn mad” about his fooling around, but she was willing to look the other way as long as he was careful and didn’t humiliate her.

However, she complained of the President’s love-making to her long-time confidant Dr. Frank Finnerty, claiming “he just goes too fast and falls asleep.” Andersen’s book also offers insights into JFK’s dependence on drugs.

His physician, Max Jacobson, known as Dr. Feelgood, administered high-dosage amphetamine shots laced with steroids to the President on a regular basis, the book claims, and even the First Lady.

Dr. Max’s four-times-weekly injections worried other physicians who believed they might react with the dozen or so other drugs Jack was taking for his other health woes.

Gore Vidal reportedly said he was “horrified” to learn Dr. Feelgood was treating the President and, according to the book, told Jackie to “Watch out” because “Max drove several people mad.”

In addition to the drugs, JFK’s infidelities were a source of concern for Jackie.

JFK’s Air Force aide, General Godfrey McHugh, revealed early on that “Jackie knew about his women,” and her friend Ralph Martin agreed.

“You know, in the end Jackie knew everything. Every girl. She knew her rating, her accomplishments…”

Despite knowing about the affairs, Jackie still feared her own sexual inadequacies were pushing Jack into the arms of other women.

As Andersen writes, “Jackie knew ‘everything’ about the women, but she didn’t take his cheating lightly.”

Nevertheless, Marilyn was a source of particular worry for Jackie because the actress was intent on becoming JFK’s second wife.

“Marilyn’s sights were firmly set on becoming the President’s second wife,” according to Andersen.

“Can’t you just see me,” she reportedly asked her friend Jeanne Carmen, “as first lady?” Meanwhile, JFK’s friend Peter Lawford claimed Marilyn called Jackie and told her she was sleeping with Jack, and that he’d allegedly promised to leave his family for her.

Andersen’s book offers an intriguing look into the lives of JFK and Jackie Kennedy during their final year together.

Despite the infidelities and drug use, they managed to maintain a public image of perfection. However, behind closed doors, things were far from perfect.

Jackie knew about the affairs but was willing to look the other way, while JFK was dependent on drugs to keep up his frenzied pace.

The book also sheds light on the President’s medical history, including his chronic back pain and Addison’s disease.

Despite his numerous health problems, JFK managed to keep up a grueling schedule, thanks in part to Dr. Feelgood’s injections.

The book suggests that the President’s drug use may have contributed to his erratic behavior, which was on display during the Cuban Missile Crisis.