Kristin Cavallari reveals she called off her wedding to now husband Jay Cutler because she didn't want to be a stay-at-home wife and mom

Kristin Cavallari is opening up on why she called off her wedding to her now husband Jay Cutler in her book, Balancing In Heels: My Journey To Health, Happiness and Making It All Work.

The 29-year-old revealed that she broke off the engagement in July 2011 because 'at that moment, something wasn't right. A few things needed to change, and I knew the only way Jay would see how serious I was, was if I ended the relationship.'

In her book, which is set to be released on March 15, the reality star explained that one of the main issues was that she didn't want to be a stay-at-home mother and wife.

'If I stayed at home, I wouldn't be happy. And would probably end up resenting Jay for it,' she writes in an extract obtained by Us Weekly.

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Truthful: Kristin Cavallari is opening up on why she called off her wedding to her now husband Jay Cutler in her book, Balancing In Heels: My Journey To Health, Happiness and Making It All Work

The former Hills star further explained in her book: 'I always go after what I want in life, with men or otherwise, and I never settle. If something doesn't feel right, I act on it. It's just who I've always been.'

Kristin and the Chicago Bears quarterback, 32, reconciled four months later in November 2011, eventually tying the knot on June 8, 2013.

During the break in their relationship, Kristin wrote that she was 'dying inside' although they still stayed friends.

Kristin and Jay worked on their issues by getting professional help from a couples therapist.

Honesty: The 29-year-old revealed that she broke off the engagement in July 2011 because 'a few things needed to change, and I knew the only way Jay would see how serious I was, was if I ended the relationship'

The beauty explained: ''I credit [our therapist] for saving our relationship. She opened up our eyes to the other person's perspective and gave us great tools for communication.'

Adding: 'We still periodically see her to this day.'

They are parents to three children: three-year-old Camden, 22-month-old Jaxon and four-month old daughter Saylor.

Opening up: In her book, which is set to be released on March 15, the reality star explained that one of the main issues was that she didn't want to be a stay-at-home mother and wife

The couple originally met in late 2010 after Jay reached out to Kristin's publicist on wanting to meet her.

The stunner wrote in her book: 'When I was in the middle of filming The Hills, I got a phone call from my publicist saying that Jay Cutler wanted to fly me out to Chicago and take me on a date.'

However, she didn't agree on a date immediately, opting to wait until she felt ready.

Kristin wrote: 'A year later, a year in which I grew up a lot and felt serious about meeting a good man...I called up my publicist and got us family passes to meet Jay after the game.'

Beside her upcoming book, the former MTV star is also a shoe and jewelry designer.

She founded Emerald Duv, a jewelry brand featuring handmade pieces manufactured in Los Angeles; she also designs a line of shoes for Chinese Laundry.

Mom life; They are parents to three children: three-year-old Camden, 22-month-old Jaxon and four-month old daughter Saylor; pictured with her youngest, Saylor

Pure happiness: Her husband Jay and their two sons Jaxon (L) and Camden (R) enjoy a day at the beach, as seen on Kristin's Instagram