The country superstar has long battled alcohol and drug addiction and he reached a breaking point four months after his marriage to the "Moulin Rouge!" star in 2006.
Kidman helped stage an intervention and Urban checked into the Betty Ford Center in a bid to kick his bad habits for good.
During an appearance on "The Oprah Winfrey Show" on Monday, Urban revealed he thought his addictions would "tear" the couple apart and "destroy" their marriage.
And the singer insists he would have understood if Kidman had left him, telling the TV host, "Well that's the point right there where she should have just walked. Not should have, that's not the right word, but I (would have understood if she had). Of course... I'm just glad she didn't."
He also praised Kidman for the way she handled the situation, adding, "It was really a profound moment in so many ways. The way in which Nic handled that moment was just perfect... Everything was just designed, I believe, for that moment to fuse us together."
Kidman was also interviewed on the show and told Winfrey the tough times made their relationship stronger: "I think marriage is about, every day, trying to make it better and working through things and when things are tough, saying, 'I'm going to come to you and talk.' We're just very tight, and we stay really tight."
Keith Urban On Nicole Kidman
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