According to Elon Musk’s biographer, the billionaire’s romance with Amber Heard was the most traumatic experience of his life. Walter Isaacson admitted on Kara Swisher’s podcast that “nothing hurt him more than that relationship.” Isaacson stated that the “storm and turmoil” of the relationship was “part of the attraction.”

Elon Musk’s biographer said the billionaire’s relationship with the actor Amber Heard hurt him the most — even more than Musk’s fraught relationship with his father.

“The storm and turmoil that both sides tell me about, this is not a matter of dispute, that was part of the attraction,” Walter Isaacson said on the latest episode of the “On With Kara Swisher” podcast. “Part of the theme of this life is this person is attracted to drama and storm. When things are calm, he surges — he buys Twitter or whatever. So, this is true of the relationship with Amber. Nothing hurt him more than that relationship.”

Musk and a lawyer for Heard did not immediately respond to requests for comment.

Musk and Heard dated on and off after bonding at the 2016 Met Gala. They took their relationship public in April 2017 before announcing their breakup a few months later. They continued seeing each other after their split before breaking up again in 2018.

Isaacson spent two years shadowing Musk for the biography, which hit shelves last week.

The book described a “psychological turmoil” in many of Musk’s romantic relationships. It recounted Musk’s and Heard’s first meeting: She asked if she could visit SpaceX a year after the two worked on the action film “Machete Kills,” Heard as a star and Musk as a consultant.

Isaacson also noted their explosive battles, writing, “She and Musk would stay up all night fighting, and then he would not be able to get up until the afternoon.”

Heard stated in the memoir that she “very much” liked Musk, but that “Elon loves fire and sometimes it burns him.”

When Isaacson questioned Musk about his turbulent romantic history, the billionaire responded, “I am often a fool, but especially for love.”

Musk’s ex, Canadian musician Grimes, with whom he shares three children, told Isaacson for the biography that Musk “associates love with being mean or abusive” due to his relationship with his father, Errol Musk.

Musk claims his father bullied and demeaned him throughout his childhood. In 2017, he told Rolling Stone that his father was a “terrible human being” who did “almost every evil thing you could possibly think of.”

Errol Musk denied berating his son.

Musk’s first wife, Justine Wilson, to whom he was married from 2000 to 2008, has spoken about their relationship.

“There is a combative element to him,” she told Isaacson. “I don’t think you can be in a relationship with Elon and not argue.”

“When you’re from a dysfunctional background or have a brain wired like his,” Wilson told Isaacson, “intensity takes the place of intimacy.”