And the Hollywood actress also references his alleged affair with their nanny, saying it had nothing to do with their divorce.
In an interview printed in Vanity Fair, The Dallas Buyers Club star, 43, says: "Let me just tell you something. We had been separated for months before I ever heard about the nanny. She had nothing to with our decision to divorce. She was not a part of the equation."
Seeming to confirm the rumoured affair, Jennifer added: "Bad judgment? Yes. It's not great for your kids for [a nanny] to disappear from their lives. I have had to have conversations [with my children] about the meaning of scandal."
His team have strenuously denied all claims of an affair.
Jennifer adds: "People have pain - they do regrettable things, they feel shame, and shame equals pain. No one needs to hate him for me. I don't hate him. Certainly we don't have to beat the guy up. Don't worry - my eyes were wide open during the marriage. I'm taking good care of myself."
In the candid interview, she also describes Gone Girl actress Ben as the "love of her life".
She says: "He's the love of my life. What am I going to do about that? He's the most brilliant person in any room, the most charismatic, the most generous. He's just a complicated guy. I always say, 'When his sun shines on you, you feel it.' But when the sun is shining elsewhere, it's cold. He can cast quite a shadow."
The Hollywood power couple, who have three kids together, confirmed the end of their relationship last June, just days before their 10th wedding anniversary.
They issued a statement saying: "After much thought and careful consideration, we have made the difficult decision to divorce. We go forward with love and friendship for one another and a commitment to co-parenting our children whose privacy we ask to be respected during this difficult time.
"This will be our only comment on this private, family matter. Thank you for understanding."
They married in a private ceremony in 2005 on a beach in Turks & Caicos.
She was previously married to Felicity co-star Scott Foley, while Ben had been engaged to Jennifer Lopez.
Ben and singer Jen - known as 'Bennifer' - first became an item in 2002 and were together for 18 months before calling off their engagement in 2004.
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