Peter Andre says his break up with model Katie Price has been "the worst few months" of his life.
The singer was talking about the split to Chris Moyles on his Radio 1 breakfast show.
He said: "There's a lot to it. I definitely knew what I had to do. I'm obviously never mentioning the reasons, but there's not just one reason."
Peter Andre and Katie Price announced their separation on 11 May after three-and-a-half years of marriage.
The celebrity pair married on 10 September 2005 at Highclere Castle in Berkshire.
Peter Andre became stepfather to Katie Price's son, Harvey, from her previous relationship with footballer Dwight Yorke.
The couple also have two children of their own, Junior and Princess Tiaamii.
Peter Andre told Chris Moyles there wasn't any chance he and Katie Price would get back together.
He said: "No. No, what's done is done. Let's not forget the fact there are far bigger problems in the world.
"But when you are in your own situation it feels like the biggest problem in the world.
"The hardest bit that's happened out of all of this is acceptance and when you can accept it then you can move forward. I'm going through the acceptance stage, which is very difficult."
Peter Andre also admitted that his children were the most important thing in his life and were what kept him humble during his separation from Katie Price.
"They're awesome. They give you a sense of stability. They make you humble," he said.
"They definitely keep you fit. It's the best part of my life."
Peter Andre says he saw Katie Price for the first time since their split last week.
"It was brief. When it's for the children, for a split second there, you just don't think about anything really. You just get on with it."
The couple got together after appearing on I'm A Celebrity... Get Me Out of Here! in 2004.
They then released a charity album of duets in 2006 called A Whole New World before appearing on their own reality show Katie & Peter: The Next Chapter.
The singer, who's releasing a new single called Behind Closed Doors on 10 August, revealed he and Katie Price were still under contract with a TV production company for another year.
"I am filming. I've been contracted for two years, as Kate was. For the first five weeks (after the split) I hardly even talked.
"The first bit of filming was when I went to Hong Kong, which was about two weeks ago."
Katie Price, who's also known as Jordan, has had some negative press since the split after she was pictured partying around Ibiza.
But Peter Andre says he hopes it will end soon.
"I don't want her to be getting the bad press because I don't want the kids to grow up and read any of it," he said.
"In a way, I hope that will all die down. I don't want her to feel that pain."
Katie Price, 31, has also been quoted in the newspapers slating Peter Andre but he told Newsbeat after coming off air with Chris Moyles that he wasn't willing to get into a slanging match.
He said: "Obviously I'm aware that Kate's going to do a live interview with Piers Morgan.
"I've no idea what's going to be said. I don't want to watch it but at this point, I say no. I haven't even thought about talking about it."