Never-before-seen letters from Jackie Kennedy to an Irish priest reveal her secret heartache JFK would be unfaithful even before they wed.
America's former first lady, who was deeply Catholic, said she feared her husband would turn out to be like her father.
In one letter written in 1952, a year before she married the US president, she wrote:
– Jackie Kennedy
He's like my father in a way. He loves the chase and is bored with the conquest- once married needs proof he is still attractive so flirts with other women and resents you. I saw how that nearly killed mummy.
ITV News Correspondent Nina Nannar has this video:
But despite her heartache over his womanising ways, in 1954 she told the priest: "I love being married much more than I did in the beginning."
The letter exchange started when Jackie met Rev. Joseph Leonard during a trip to Dublin, Ireland in 1950 when she was 21, and continued until the priest died in 1964.
Despite her world being the epitome of glamour Jackie spoke of what it was really like behind closed doors.
She said: "Maybe I'm just dazzled and picture myself in a world of crowned heads and Men of Destiny- and not just a sad little housewife."
But she added:
– Jackie Kennedy
That world can be very glamorous from the outside- but if you're in it- and you're lonely- it could be a Hell.
And following JFK's assassination in 1964 she spoke of being 'bitter against God' and said she wished she had died instead.
She said: "I feel more cruelly every day what I have lost. I always would have rather lost my life than lost Jack."
Now the cache of 30 letters will be auctioned off at Sheppard's Irish Auction House on June 10 and are expected to fetch over €1million (£817,000).