In the Apple Music show, he describes Liam Payne as a "super special person" whose death he still finds difficult to talk about, writes the BBC.
He also says that it was very difficult to lose a friend who "in many ways is so similar to himself."
Later this week, Harry Styles will release his fourth solo album after a three-year hiatus from the spotlight.
"I think what makes people like an artist is when they can see that person is a regular person," says Styles.
It's not about being mysterious. We're all just ordinary people, and then there are some people who let others see them as completely ordinary people.
Liam Payne died in 2024 after falling from a balcony in Argentina. He was 31 years old.
