"Johnny went on to tell me that the three women he had told me about the first night I had met him were, in fact, not real and that he had made them up... My mind was racing... He had told me detail upon detail. I remembered the ups and downs of emotion I had felt the night he went to Chicago to break off his relationship there," she writes. "My reality in our relationship had been ripped out from under me."
When Hunter asked about a secondary cell phone Edwards owned in the first months of their relationship, and on which he received calls, he said, from his other mistresses, Edwards admitted the phone was a gift from his "second ex-mistress."
Edwards, she said, confessed to having additional affairs before 2004, but led her to believe she was his last conquest.
Tune in to "20/20" Friday for an Exclusive Interview With Rielle Hunter.
After learning that Edwards had lied to her throughout the entire length of their relationship, she writes that "[I] beat myself up with mean thoughts followed by awful feelings."
Ultimately, however, she shrugs off the deception, concluding "Johnny didn't do anything out of character. He has a long history of lying about one thing only -- women -- and I mistakenly thought I was different."
Hunter may be vague about the status of her current relationship with Edwards in the book, but she makes abundantly clear her sympathy as well as her disdain for the actions of his wife Elizabeth, who died in 2010.
Hunter depicts Elizabeth Edwards as woman routinely angry at Edwards, who constantly "barks" demands at her husband, summarily fires staffers and vigilantly works to maintain a public persona as a "saint," when Hunter implies she is a "witch on wheels."
Following their first encounter, Edwards hired Hunter, then working as a life coach, as a videographer to join his campaign in its first few months. Hunter travelled extensively with Edwards including on a trip to Uganda, where at his request she filmed a video of the couple having sex.
When staffers became suspicious of the affair, Hunter left the campaign and their trysts became increasingly furtive, meeting under assumed names in various hotels.
On Dec. 31. 2006, Elizabeth uncovered the truth, calling Hunter from what she calls Edwards' "other woman" phone, a secondary cell he used to call Hunter and possibly other mistresses.
"Hey, baby," Hunter answered assuming it was Edwards. Elizabeth simply hung up.
Elizabeth, Hunter writes, repeatedly called her "for the next two days at all hours of the day and night from various numbers" in an attempt to intimidate her.
Edwards was also subjected to Elizabeth's wrath as she "physically attack[ed] him during all the screaming."
Hunter has little sympathy for Elizabeth's behavior. She writes that Edwards' wife of three decades, with whom he suffered the death of their oldest son Wade, "was bonkers because she had been in denial" about his cheating.
She describes Elizabeth as "crazy," and a "venomous" "witch on wheels" who is given to fits of "rage."
In July 2007, Hunter learns she is pregnant and reveals her pregnancy one week later to Edwards and his aide Andrew Young.
Young and his wife Cheri had taken on the role of keeping Hunter hidden from his increasingly suspicious wife and the even more suspicious tabloid the National Enquirer.