Neil Jones refused to let his wife Katya's kiss with another man "get in the way of 10 very happy years".
The professional dancers and "Strictly Come Dancing" stars have been married for six years and together for 10 but their union was rocked last year when the Russian dancer was pictured locking lips with comedian Seann Walsh after a night out drinking in a pub.
Speaking to the Daily Mail's Weekend magazine, he said: "It was a shock. And we had to work it out between ourselves, to understand what had happened.
"But I wasn't going to allow that one little thing to get in the way of 10 very happy years. People have said to me, "Why didn't you feel this? Why didn't you say that?" For me, the initial reaction was to stay calm. I didn't want to run around in a panic, because that's not me.
"I'm private. I'm also quite positive. I wanted to speak to Katya - we had to sort it out privately."
And he revealed that his mother encouraged him to forgive Katya.
He explained: "Mum always said people make mistakes, and you have to be understanding. It was a mistake, and we're here now, together, moving on."
And Katya insisted she is sorry for the incident but wants to move on.
She said: "Of course I regretted it. I apologised for the pain I'd caused, to Neil, to our families, even to the fans, who didn't expect that.
"Emotions were high, but "Strictly" said we could continue, so I knew I had to teach this person how to dance, no matter what."
To show the world that their marriage is very much on track, Neil, 36, and Katya, 29, are touring their own show "Somnium: A Dancer's Dream" which is inspired by their romance and their life together.
Explaining the inspiration behind the dance extravaganza, Neil recently said: "It's based on our story. There's moments in, within the story, it's not about what happened there, it's about a World Championships."