"You just have to brush yourself off and continue moving forward the best you can," Sanders said. "Everyone makes mistakes. I am bound to make more mistakes, and I wouldn't expect my life to be exciting if I didn't."
Sanders was married to Liberty Ross when photos of him and Stewart kissing emerged in 2012. Stewart was in a relationship with "Twilight" co-star Robert Pattinson at the time.
About the affair, Ross previously told Vanity Fair that it was "the worst." Ross said, "I have no words to describe what we went through. But I think, for me, something always has to completely die for there to be a rebirth. And, for me, I feel like I'm going through a rebirth."
Stewart addressed the affair in a Marie Claire interview, calling it a "traumatic period."
"I lit my universe on fire and I watched it burn," Stewart told the magazine. "Speaking very candidly, it was a really traumatic period in my early 20s that kick-started something in me that was a bit more feral."