"Anyone who has been through it knows, it is kind of shocking when it ends up happening," she said about the moment she realized she couldn't fix her marriage.
"It was sad for our family unit. But we will always be a great family, because we have three beautiful daughters together."
Garth has been forced to face the media in the midst of her relationship breakdown as she promotes her new reality show, Jennie Garth: A Little Bit Country, and that hasn't been easy for her either.
"That is probably the hardest part about it," she said. "The timing of everything. When I decided to take this show on, I wasn't headed down this road. It happened in the middle of filming the show.
"Now I am doing the press circuit for the show and doing interviews and people want to talk about it. I am okay talking about it, but it's not something you really want to talk about."
As for the reports that her marriage ended because she couldn't handle her husband's fame?
"I enjoyed the quote that I was envious of his fame. There was nothing like that going on. I was very happy for him and so happy to be at home with the kids enjoying my early retirement. I didn't want to work at that time. I just wanted to be at home on the farm," she said.
And so life goes on for the former Beverly Hills 90210 beauty who - like the title of her show suggests - has moved to the country with her three children, Luca, 14, Lola, 9 and Fiona, 5.
Jennie Garth: A Little Bit Country premieres on CMT on Friday, April 20.
Watch Garth's TODAY interview below:
Peter Facinelli Files For Divorce From Jennie Garth