Walsh, 34, was photographed kissing Neil’s wife Katya outside a pub when they were paired up for the 2018 series of the BBC dance competition.
At a comedy show in December 2018, Walsh reportedly joked that he was “the guy who kissed a gay man’s wife.”
Neil, 36, and Katya, 31, later announced their split in August, after 11 years together, but insisted that the kiss was not the reason for the break-up.
In a new interview with The Sun, the professional dancer addressed his sexuality, telling the paper: “In ballroom there’s a lot of straight guys.
“But mum was always like, ‘It’s a shame you’re not gay because we could go shopping together.’
“And I was thinking, ‘whether I’m gay or not there’s no chance, you take forever.’”
In a statement confirming their split, Neil and Katya said that they had come to the decision mutually and would continue to work and dance together.
“After 11 years, we have made the mutual decision to separate,” they said.
“We will always love each other, just in a different way as friends. This will never change what a great team we make and we are really proud of everything we have achieved together.
“Our shared love of dance means we will keep working and dancing together as well as exploring individual projects. No matter what we do we will always support and respect each other.”
A spokesperson for the pair then clarified that the decision to split was not influenced by the kiss controversy.
“It would be incorrect and unfair to attribute their separation to one isolated incident,” they said.
“Many people make such a decision to separate when they realise that their relationship has become more of a friendship.
“They remain the best of friends and will continue to dance together.”