The former Beverly Hills, 90210 actress and Twilight's Facinelli announced their divorce on Tuesday after 12 years of marriage.
Garth has since discussed the relationship in a clip from her forthcoming reality series Little Bit Country, in which she describes the couple's separation as "the right thing" for them and their children.
"Being out here on my own with the girls is not going to be easy, but I know it's the right thing for us right now," Garth said. "I feel it in my heart. I'm excited about what's next."
Garth and Facinelli, who met while shooting the 1996 film An Unfinished Affair, are parents to three daughters, 14-year-old Luca, 9-year-old Lola and 5-year-old Fiona.
The pair recently denied reports that cheating caused their split.
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Watch a clip from Jennie Garth's Little Bit Country below: