"It's always destabilizing when you're potentially breaking up a family or you have a big section of your life that's ending," he tells People magazine. "Everybody has their own path. Jill and I decided it was time to work on our issues and improve. We wanted to be role models for our kids like, okay, if you have differences, you can work them out."
The 50-year-old actor admits that he wasn't ready to throw in the towel on his marriage. "I didn't feel like we had done all the work. And we both wanted to do that work. That's where it started," he says. "I [learned] to prioritize. Our union has to be the priority. I wasn't prepared to give up on her and she wasn't either. We both wanted to fight for it."
The actor has been busy promoting his new movie, Bridget Jones's Baby, which hits theaters September 16, and walked the red carpet with his wife and kids, 14-year-old daughter, Tallula, and 9-year-old twin boys, Darby and Sullivan, at Monday's premiere in London, England.