Rielle Hunter says she and former presidential candidate John Edwards have ended their relationship.

Hunter told ABC's "Good Morning America" on Tuesday that she and Edwards were still a couple until late last week, as details from Hunter's memoir became public. The breakup was painful, but Hunter said Edwards will still be involved with their daughter, Quinn, who is 4 years old and lives with Hunter.

"We are a family, but as of the end of last week, John Edwards and I are no longer a couple," Hunter said on Tuesday's show. "We decided together to end it."

The book, "What Really Happened: John Edwards, Our Daughter and Me," is being released Tuesday through a Dallas-based boutique publisher, BenBella Books. The Associated Press reported on the book last week.

In the book, Hunter describes intimate details about her affair with Edwards, whose campaign hired her as a videographer, and sheds light on his thoughts as federal prosecutors mounted a case against him on illegal campaign contribution charges.