The "Do You Know" artist opened up about her relationship with Mayer, which she described as "emotionally manipulative" and "dysfunctional" in her memoir "Open Book," while appearing on the "Tamron Hall Show" Friday.
Hall asked Simpson whether Mayer should publicly apologize for his public treatment of her, to which she responded "no."
"No, I definitely don't feel that I am owed a public apology," Simpson said. "I mean, you can't take it back. And I'm a very forgiving person but I'm also honest. So, in the memoir, if I'm gonna talk about stuff that caused me pain, I'm going to be honest about it. And that was a time in my life that I was very manipulated and very also in love, or seemingly."
In her tell-all released in February, Simpson wrote that her relationship with the singer ended after he detailed their sex life in a 2010 Playboy interview, when he referred to her as "sexual napalm."
"I was floored and embarrassed that my grandmother was actually gonna read that," she wrote "A woman and how they are in bed is not something that is ever talked about."
Simpson added that she "wouldn't expect an apology," nor did she believe "there's a need for an apology, because I feel like people end up finding their way to let you know they're sorry."
"He might not be sorry and that's OK," she continued. “To talk about anybody sexually is kind of disrespectful. But that’s on him."
Hall also asked Simpson whether she had watched "Framing Britney Spears," the FX/New York Times documentary examining the rise of Spears, her mental health challenges, inappropriate treatment by unrelenting media and the discord over her conservatorship, controlled largely by her father, Jamie Spears.
"If I were to watch it, like, reliving that for me it's like one of those like triggers, you know, it definitely gives me anxiety and I lived it," Simpson said.
She added that it's "so hard," because she personally knows Spears and "what she went through."
'Framing Britney': Britney Spears says she's focused on being 'a normal person'
"It's so hard, because it's so many people's opinions on you just trying to live your life as a normal human being, because inside we're really just, you know, we are normal, you know?"
Though she acknowledged both she and the "Toxic" singer "have a big platform," Simpson explained that "you can only take stuff for so long."
"You can only allow people in and attacking you until you have to really put your guard up," she said.
Contributing: Rasha Ali, Erin Jensen
This article originally appeared on USA TODAY: Jessica Simpson talks ex John Mayer, 'Framing Britney Spears'