Gorgeous R-Pattz became embroiled in one of showbiz's biggest scandals two years ago when it emerged long-time girlfriend Kristen had embarked on an affair with a married film director.
When it was unveiled, she issued an emotional public apology to everyone she had let down, including Rob. They later reconciled their romance before splitting - but the British actor had always remained silent in public about the whole incident.
Now, in an interview with Esquire, he says: "S**t happens, you know? It's just young people. It's normal! And honestly, who gives a s**t?"
He added: "The hardest part was talking about it afterwards. Because when you talk about other people, it affects them in ways you can't predict. It's like that scene in Doubt, where he's talking about how to take back gossip? They throw all those feathers from a pillow into the sky and you've got to go and collect all the feathers."
Rob and Kristen met on the set of the first Twilight movie - playing Edward and Bella - and conducted a romance both on and off screen.
They split for good in 2013.
After the cheating scandal was revealed by a magazine in 2012, notoriously private Rob said he had no interest in sharing his side of the story with the public.
"You go into it to do movies," he said. "I've never been interested in trying to sell my personal life and that's really the only reason people bring it up."
Kristen, meanwhile, issued a public apology that year, saying: "I'm deeply sorry for the hurt and embarrassment I've caused to those close to me and everyone this has affected.
"This momentary indiscretion has jeopardised the most important thing in my life, the person I love and respect the most, Rob. I love him, I love him, I'm so sorry."
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