The 'Twilight' actor recently filed papers at Los Angeles County Superior Court to dissolve his 11-year union with the former 'Beverly Hills 90210' actress but Jennie admitted she was ''resistant'' when Peter first suggested they should split.
She told People magazine: ''I was very resistant. I didn't want it to happen. It took me some time to come to peace with it.
''I've gone through my darkest parts and I'm coming out of it. I'm OK. I don't know what the future holds, but then I've never been a planner. And maybe that's a good thing.''
Jennie - who lives in California with her three daughters Luca, 14, Lola, nine, and five-year-old Fiona with Peter - blames his work commitments including filming the 'Twilight Saga' in Vancouver and 'Nurse Jackie' in New York for causing the breakdown of their marriage.
She explained: ''He would do everything he could to fly back every weekend. [But] it took a real toll on our marriage.''
Peter - who is seeking joint physical and legal custody of the couple's daughters - has cited ''irreconcilable differences'' as the reason for the split and listed their separation date as January 1 2012.
Jennie simultaneously filed her response to the divorce petition, also asking for joint legal and physical custody of the children.
She also requested to have her name legally changed from Jennifer Facinelli back to Jennifer Garth.