(This article has been updated to include additional information.)

Deryck Whibley is sharing the complete truth about his life in rock music.

The lead singer of Sum 41 released his memoir, “Walking Disaster: My Life Through Heaven and Hell,” on Tuesday, where he opened up about the sexual abuse he claims to have endured during his time with the band’s former manager, Greig Nori.

“For a long time, I thought I would never discuss this,” Whibley shared in an interview with the Toronto Star that was published on Monday. “It was a dark secret that I planned to take with me to my grave.”

“But I realized I couldn’t tell my story without addressing it, as it was deeply connected to everything happening in my life during that time, almost daily.”

Whibley, who met Nori at age 16 during the early days of the pop-punk band, alleges in “Walking Disaster” that Nori, who was then 35 and a frontman of the Canadian band Treble Charger, coerced him into a sexual relationship after first becoming his mentor.

In an interview with the Los Angeles Times published Monday, Whibley revealed that he did not share Nori’s alleged abuse with his bandmates, nor did he confront Nori directly about his accusations in the memoir.

“I don’t owe him anything,” Whibley stated to the L.A. Times, but he noted he struggled with the notion, “Why should I tell him? Is it because I feel I should? Because he still has a hold over me? He controlled so much of my life, and he had a similar effect on the rest of the band. We were all under his influence, me more so.”

At the time of publication, there was no comment from Nori’s representatives.

Deryck Whibley reflects on his relationship with Greig Nori and claims of abuse

In “Walking Disaster,” Whibley recounts how he first met Nori by sneaking into Treble Charger’s dressing room after a concert.

He describes Nori as someone who introduced him to “the basics of songwriting” and likened him to an older brother or father figure. Whibley emphasized that he and his bandmates were unaware of Nori’s age and didn’t care at the time.

“I wanted to spend all my time with him because he appeared cool, generous, and kind,” Whibley wrote. “I was young and completely captivated by Greig Nori.”

When Nori showed interest in managing Sum 41 after Whibley secured a publishing deal with EMI Publishing Canada, Whibley noted, “He was my hero, my mentor, my guide, and now he wanted to lead us.”

“Nori had just one condition to manage us — he wanted total control,” Whibley disclosed. “We couldn’t speak to anyone else because the music industry was ‘full of snakes and liars,’ and he assured us he was the only trustworthy person. Being young and eager, we believed him.”

Whibley claims their relationship became physical when Nori kissed 18-year-old Whibley during a party, where they entered a bathroom stall together to consume ecstasy.

“In that cramped, unsanitary bathroom stall, I was rambling when he suddenly grabbed my face and kissed me passionately,” Whibley recalls. “I was left confused. Should I be upset? Did I actually like it? Was he gay? Was he just high? So many thoughts flooded my mind that I couldn’t sort through them.”

Although Nori later apologized for the kiss, Whibley stated that Nori was persistent about moving further when they were together, leading him to feel “pressured to act against my will.”

Deryck Whibley confided in Avril Lavigne regarding Greig Nori’s alleged abuse

Despite not having feelings for men, Whibley admitted that his physical encounters with Nori continued, although he felt he could only engage in acts like kissing and mutual touching.

When Whibley attempted to end the sexual aspect of their relationship, he recounted that Nori accused him of grappling with the “stigma of being gay or bi.”

“I felt so ashamed for finding myself in this situation, but I also felt guilty for that shame, thinking it made me homophobic,” Whibley elaborated. “I was still stuck believing in Greig’s greatness, and the possibility of him being a predator was a truth I refused to face. I couldn’t share any of this. I wanted to protect him.”

Whibley’s “extremely complicated” relationship with Nori intensified when he started dating fellow pop-punk artist Avril Lavigne in 2004.

Concerned about how Nori would take his new relationship, Whibley admitted to sneaking in and out of Lavigne’s place in Toronto, located “just two doors down” from Nori’s home.

Whibley later opened up to Lavigne about his difficult relationship with Nori, which included instances of physical encounters. The “Sk8er Boi” singer responded by saying, “That’s abuse! He sexually abused you!”

Reflecting on these experiences, Whibley wrote in his book, “Later, I found myself lying in bed, questioning. Was it really abuse? Could it still be classified as abuse if I consented?” He shared that he didn’t believe it was abuse, feeling like it was his own fault and refusing to see himself as a victim.

Deryck Whibley reflects on his ‘manipulative’ relationship with Greig Nori

Sum 41 ended their partnership with Nori after the Go Chuck Yourself Tour in 2005, due to their increasing dissatisfaction with his management.

While Whibley states Nori “never physically restrained me or compelled me to do anything,” he considers their relationship from a different perspective as an adult.

Whibley questions, “What made a 35-year-old man give a teenager his phone number backstage at a concert? Why would a rockstar want to hang out with a kid who looked and acted like he was only 14?” He indicates that Nori’s actions felt “predatory.”

“At the time, I truly believed he was interested in my band, but now, in my adult perspective, that idea seems ridiculous.”

“I had never encountered the term ‘grooming’ until I was an adult. When the #MeToo movement gained traction, I started hearing stories similar to my own,” Whibley concluded. “Was it abuse? Was it my responsibility? Did he provide us with drugs and alcohol at such a young age for a reason? I’m unsure. However, I cannot deny he was extremely manipulative.”

If you are a survivor of sexual assault, RAINN is here to help through the National Sexual Assault Hotline at 800.656.HOPE (4673) and at Hotline.RAINN.org, including support in Spanish at RAINN.org/es.