"I had personal setbacks, but this was, without any doubt, the biggest setback and the biggest failure," the action star revealed. "Without any doubt. Not only failure, but you feel like, 'I'm to blame for it. It was me that screwed up.' And you can't point the finger at anyone else. So yeah, I was disappointed in it. It's always easy to be smart in hindsight. The thing was how do you make the best of that situation?"
Maria and Arnold filed for divorce in 2011 after the California Governor publicly admitted to having an affair with the family's housekeeper and fathering a child with her years beforehand.
And it wasn't for a lack of trying that their marriage wasn't saved, because the 67-year-old revealed that he and his ex-wife had taken their issues to a therapist.
"It was the biggest mistake I've ever made. That guy was so full of s--t. He said more crap and more nonsense. It was absolutely counterproductive to our future relationship... Maria talked me into it. I went, and I felt instinctively maybe I shouldn't go because I know I screwed up. I don't have to go through anyone to have to explain to me anything. I apologized to Maria. I apologized to the kids."
In spite of those mistakes, it seems bridges have been rebuilt within Arnold's family in the years following the scandal.
"It has worked out really so well with the help of Maria," he confessed. "My kids are a straight 10," the Total Recall star added. "I am so proud of them. I'm so in love with them."
And yes, that goes as much for his "love child" with Mildred Baena as much as it does for the four he shares with Shriver.
"He's terrific and he totally understands the situation," Arnold revealed. "So, it all has worked out... It's a very tough situation for him. It's a very tough situation for my kids. Very tough situation for my family. It was tough for everybody. But it has happened and now we have to figure it out, right?"
Terminator: Genysis arrives in movie theaters on July 1st.