Jessica Simpson doesn’t care what ex John Mayer thinks of her memoir

Jessica Simpson is baring all the secrets of her life, warts and all – and one of her famous ex-boyfriends should really brace himself.

John Mayer should brace himself for Jessica Simpson‘s forthcoming memoir, Open Book.

The popstar-turned-fashion designer opens up about everything from being a victim of childhood sexual abuse to her addiction to pills and alcohol but goes all-in on her relationship with ex-boyfriend Mayer.

RELATED: Simpson explains ‘trainwreck’ Ellen interview

RELATED: Simpson and Timberlake once had a brief fling

In a new interview with the New York Times, 39-year-old Simpson revealed she didn’t tell him about the memoir despite the fact that he appears in it frequently.

“I don’t think he’ll be shocked,” she told the publication. “He knows these stories.”

When asked how she would feel if the Your Body Is a Wonderland singer tried to use the publicity to his advantage, she replied, “I don’t care.”

Jessica Simpson and John Mayer dated in 2006. Picture: Brenton Edwards

Reps for Mayer didn’t return the Times’ request for comment.

In her memoir, Simpson reveals that her therapist made her realise Mayer never loved her — he was just obsessed with her.

“Ooh, that broke me in half!” she told the newspaper of the epiphany. “And that’s years into being married and having kids. And it was like, ‘Wow. I did this all for obsession? This was his way of loving me?’ I think that it just never clicked until it was just blatantly said to me: That’s not love.”

Simpson has been married to former NFL player Eric Johnson since 2014. They share three children together. She was previously married to Nick Lachey from 2002 to 2006.

Simpson is now married to Eric Johnson. Picture: Jamie McCarthy/Getty Images for Jessica Simpson Girls

Open Book is out February 4.

This story originally appeared in the NY Post and was reproduced with permission.