The couple announced their break-up last month and Facinelli officially filed for divorce later in March.
Garth said earlier this week that the divorce is not something she wants to talk about but in an appearance on The Ellen DeGeneres Show on Friday she acknowledged that it could help other people.
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"It's not something I'm dying to talk about," she said. "But it's something that's going on in my life and I'm not ashamed to talk about it. I think by being open and honest with what I'm going through, maybe it helps somebody else.
"I know I've heard from a lot of people that it helps them with maybe what they're going through. I'm not afraid to talk about it."
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Garth repeated the couple's assertion that they are "committed" to their daughters and revealed that she has realised how tough she is after the split.
"I think at first I wasn't sure how I was going to make it through," she said. "But I really learned that I am so much stronger than I thought I was, and if I can help other women touch into that, their strength."
Facinelli recently admitted that the divorce has been "very painful", saying: "I love her - we're just going to have a different relationship."
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