Danny Dyer said receiving a letter from his daughter Dani at a rehabilitation facility in 2016 was a reason to be convinced that he continued to receive treatment.
Speaking on BR Radio 4's Desert Island Records, the actor said he was "received what he received and was "going to go".
He told host Lauren Laverne: "Then they read a letter from my daughter Dani, which made me sit in that seat."
Although he didn't share what his daughter wrote at the time, he said he "growed up and understood that it was my life and fame, and all of this stuff was toxic".
Dale said Dany's messenger made him reflect on the pain he caused to his family and was committed to continuing treatment at the South African facility.
Dani Dyer became famous on Love Island and won the 2018 series. Since then, she appeared with her father on Celebrity Gogglebox in the Italian travel series and has classified dyes on the podcast.
Danny Dyer, who became famous in the 1999 film Human Blucking, has become one of the most well-known stars in British television and film.
In his interview, the 47-year-old talked about how fame affects his personal life, leading him to make “many wrong decisions.”
He said at one stage of his career, he was "doing a lot of drugs."
He added: “Sometimes I go to nightclubs and DJs, but overall, just wave the balcony and I get a lot of money to do it.”
Dale said looking back was “bad” and his days of “hedonism” and “crazy behavior” were over.
One of his turning points, he said, was in 2013, when he won the role of Vic Queen Vic Landlord Mick Carter in EastEnders, which he said he participated because he had “no money.”
“I have the bailiffs (coming soon), no one will hire me, and I show up at these clubs, the more drugs I take, the more I drink it, so I get stuck in this weird spiral.”
Four years later, he decided to go to Cape Town to recover at the awards ceremony at his home.
“I remember having this moment I was sitting in the suite trying to figure out how to put on a pair of jeans – I was that.
He added: "I looked up and looked at my wife and I could see her looking tired, I could hear the kids running downstairs and I thought 'I need to solve my life'."
Dale said it made him realize how addiction “affects many people around you, not just yourself.”
Dyer was nominated for Best Male Comedy Performance at Sunday's BAFTA TV Awards for his role in Mr Bigstuff.
He said much of the work he did in the early stages of his career was due to his lack of money and the additional pressure to become a first-time parent with his current wife, Joanne, at the age of 19.
"I made a few movies, but I just didn't get any salary and I was desperate to go up the property ladder," he said.
“I still live on the Council Manor with my daughter and Joe.”
Dale said he offered a documentary series called "Real Football Factory" in 2006, "can't believe the money given to me."
He added: "I can't look back now (documentary), I cringe at them, but I need to make money, I need to buy a house, I need to do the right thing."