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Emily Blunt, Michael Buble

Lester Cohen/WireImage

Michael Bublé may be one of the world's favorite crooners, but he wasn't the best boyfriend before he settled down and started a family.

The 39-year-old Canadian singer, who used to date Emily Blunt, gets candid about his past relationships in a new interview.

"I was a jerk and I was careless and reckless with the hearts of women I was with," Bublé, a married father of one, told Canadian entertainment show eTalk in an interview posted on its website on Tuesday and carried out in Dubai, where he performed as part of his world tour. "And I got my karma. I earned it. I got my butt and heart kicked and it hurt me enough that I looked in the mirror and I didn't want it to happen again."

Bublé and the 32-year-old British Devil Wears Prada and Into the Woods actress dated for about three years before they split in 2008. Blunt had met him backstage at a 2005 concert. She sings on his 2007 cover of the 1972 song "Me and Mrs. Jones" and she inspired his 2007 Grammy-nominated ballad "Everything."

Their breakup was announced several months after photos of the singer appearing in another woman's bed were posted online, according to People. The two have not commented about them.

"I think everyone looks back at some of the things we did and it's so cringy how I acted," he added. "I learned about myself, I got closer to being spiritual and learned to be in the moment and realize how short life is. It changed everything."

In 2010, Blunt married The Office star John Krasinski, who is now 35. The couple welcomed their first child, daughter Hazel, in 2014.

In 2011, Buble wed Argentinean actress Luisana Lopilato, who starred in the popular telenovelas Chiquititas and Rebelde Way. He co-wrote his single "Haven't Met You Yet" for her and she appears in the song's music video. Lopilato, now 27, gave birth to their first baby, son Noah, in 2013.

"The reason to be a good guy isn't for the person you're with, it's for you," he told eTalk. "That sounds weird, but I like me better now. I'm happier now. I'm better at what I do, I'm better on stage because I'm not pretending to be the guy I want to be."

Buble did not mention Blunt by name in his sit-down with eTalk. He had talked about their relationship and breakup in an interview with the U.K. newspaper The Telegraph in 2009.

"One of the worst and greatest things that ever happened to me," he said. "When it happened, obviously it was devastating, man. Emily is truly one of the most amazing and wonderful people that I've ever known. And really, even now I sit and I'm thrilled that I got a chance to be a part of someone's life who's touched so many lives and is so amazing."

"There were a lot of things I did and a lot of mistakes I made that I can't take back," he added. "So I realize that. And I took the opportunity to learn from it and to grow. I'm a much happier guy. I'm far more content in my life. And the truth is, I like myself. I like myself enough to really like somebody else."