Dean confirmed last week that his 16-year partnership with Jill Trenary was over.
The mother of his two children has now told the News Of The World that she filed for divorce because he was never at home. Trenary added she was stunned by reports which claimed that Dean has been spending nights with married show judge Karen Barber.
"I wasn't aware he had a relationship with Mrs Barber - it's hurtful," she said. "I really don't have any information about her as it's not something Christopher and I have discussed. Let's just say I didn't and don't want to discuss it with him."
Trenary said Dean, 51, ignored her pleas to give up his mentoring role alongside Jayne Torvill on the ITV1 show. "The success of the show, with long, long separations over almost five years now, isn't conducive to a happy marriage. It was the breaking point," she said.
Both Barber and Dean have denied that they are having an affair, with Barber insisting she is just helping an old friend through his marital break-up.