"Brothers and Sisters" star Balthazar Getty is opening up about his public affair with Sienna Miller -- but says his relationship with his wife is now "better than ever."

In the new Harper's Bazaar -- where Getty poses with wife Rosetta and the couple's 4 children -- he says "It was a very challenging time for everybody involved but I loved and missed my family too much not to make it work. Rosetta is understanding enough and spiritual enough to let us try. In a way ... I feel like we're better than we've ever been."

Rosetta adds she's "open to talking about it because I believe we go through things in a public way to help other people get through it. I'd love to talk about it more with people when I'm clearer about it."

Read more about the Getty fam when the October issue hits newsstands September 28.