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Gisele Bündchen once considered throwing in the towel to her seemingly perfect marriage to NFL quarterback husband Tom Brady.

Opening up about her marriage during an interview on CBS' "This Morning" with Charlie Rose, the Brazilian supermodel revealed that learning that Brady’s ex-girlfriend Bridget Moynahan was pregnant with his child in 2007 was devastating, but ultimately she decided to stay.

"It was a challenging thing because here I am, you know, thinking, I'm dating this guy, we met, and we started dating and everything is great and then this happens," Bündchen said. "So, then I felt like I didn't know what to do. It was kind of one of those moments of like, 'Do I just run away?'"

Bündchen and Brady married in 2009 and share two children: Benjamin, 5, and Vivian, 2. His son with Moynahan, John, is now 8.

"I think, now, eight years later, I couldn't have asked for a sweeter bonus child," she said.

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While they have remained strong, it does not mean that speculation has not ran rampant about rifts – especially during the Deflatgate scandal – and she admits to having “tough times.”

"I think we've been through a few tough times together," Bündchen said in the interview that aired Tuesday. "I think that's when you know who are your friends and who loves you. My father always said the quality of your life depends on the quality of your relationships, and I think, no matter how challenging it was, we've always been supportive of one another. I think that's the most important thing you can have in life, you know? A support system and love."

The 35-year-old also got candid about retiring from the runway after more than 20 years, assuring Rose (and fans) that the transitional time will only grow into more.

"I am so grateful to be where I am right now because I feel fulfilled. I feel I've given a lot of energy and dedication and focus to that and I think 20 years is like more than half my life doing that. I feel like that is long enough," she said. “I still have some contracts and they are going to be still going forward. There are still some things I am going to be doing, but it's not my focus by any means anymore."

Bündchen admits that “it’s scary a little bit, but it’s exciting” going into the next chapter of her life and career.

“When you have no definition exactly of what it is, everything is possible. The miracles happen that way,” she said. “Magic happens that way and I worked very hard since I was 14 years old to be here today in my life at this place to make that choice."

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