Brad and Angelina reportedly split after they argued about his drinking while aboard a private plane.
The Once Upon A Time In Hollywood actor told The New York Times about his commitment to sobriety, saying, "I had taken things as far as I could take it, so I removed my drinking privileges."
Following their divorce, Brad spent a year and a half in Alcoholics Anonymous - with his recovery group comprising entirely of men.
"You had all these men sitting around being open and honest in a way I have never heard," Pitt said.
"It was this safe space where there was little judgment, and therefore little judgment of yourself."
The Oscar-winner was seemingly moved by their vulnerability and trustworthiness, as no one from the recovery group leaked Brad's stories to the press.
"It was actually really freeing just to expose the ugly sides of yourself," he said.
"There’s great value in that."
Brad and Angelina allegedly fell in love on the set of Mr And Mrs Smith when Angelina already had son Maddox in her life and Brad was married to Jennifer Aniston.
Together they share Shiloh, twins Knox and Vivienne and Pax and Zahara.
Due to Maddox's adult age, Brad does not have custody over him and they are reportedly estranged.
A source told US Weekly that Maddox has a particularly close bond with the Tomb Raider star, telling the publication: "Maddox doesn’t really see himself as Brad’s son."
Brad was not present when Angelina dropped Maddox off at college in South Korea last month.
The 55-year-old was last seen at Kanye West's Sunday Service over the weekend.