Ivana, who split with Trump a quarter-century ago, also said she was "very proud" of how their three children together - Donald Jr., Eric and Ivanka - handled themselves during their father's presidential campaign "because they were articulate, intelligent". After divorcing his first wife, Trump married Maples in 1993.
In the book - an early copy of which was obtained by the Associated Press - Ivana writes that she knew her marriage was doomed not long after a day in December 1989. He said, 'Ivana, if you want it, I give it to you, ' she told the network. "Do you?"' she writes.
Ivana Trump's new book, "Raising Trump", is scheduled to be released next week.
Ivana confessed in her book.
Raised in communist Czechoslovakia, Ivana Trump married Donald Trump in 1977, partnering with him on some of his most prominent real estate projects.
'Okay, why would I go and say bye-bye to Miami in the winter, bye-bye to Saint-Tropez in the summer, and bye-by to spring and fall in NY?
"This youthful blonde lady moved toward me all of a sudden and said 'I'm Marla and I cherish your better half".
When asked why she has a good relationship with Melania and not Maples, she responded bluntly by saying, "One, it's nobody".More news: Las Vegas shooter booked hotel during Lollapalooza
"My instincts told me that Donald was smart and amusing", Ivana Trump writes.
Back in March 2017, she took on an official but unpaid role in the White House, and has since pushed for improved family leave plans that she has worked with the president on, and has also spoken out in support of women in business. "But I like my freedom".
But she turned it down because she already has the "perfect life", which includes jaunts to Saint-Tropez, and winters in Miami. And I can afford my lifestyle.
She writes: 'I can only shake my head at how it insane it was, I couldn't turn on the television without hearing my name'.
Trump had put out the idea herself during the campaign - when she notably backed her ex and said nice things about him during his run.
But she and the president have returned to far warmer terms.
'It's a new way, a new technology.
Mr Trump's affair with Marla Maples and then very public divorce with Ivana was tabloid fodder for the NY press and worldwide media alike.