Pro dancer Artem and actress Kara got together back in 2010 after winning the show together.
But things for the pair looked bleak earlier this year, with insiders saying they were leading completely separate lives.
Now Kara is said to have left Artem, claiming he was too “obsessed” with the BBC One series.
“Kara and Artem have both given this relationship their best shot but there is nothing between them any more. The passion they shared has fizzled out, they don’t have much in common,” a source told The Sun on Sunday newspaper today. “She feels he is obsessed with Strictly, while she has a life and career that is completely separate from him and that world.
“They tried to work things out, but after a while it became clear that they were flogging a dead horse and decided it would be best to end it.
“Neither wanted to create a big fuss, so they agreed to keep the split secret until Strictly finished.”
It was previously reported by the Daily Mirror that Kara had become “envious” Artem’s friendship with new celebrity partner Natalie Gumede.
But Natalie insisted: “I wouldn’t like to comment on that, that’s not for me to say… I’m just here to dance.”
Last night saw Natalie and Artem lose out to Abbey Clancy and her pro partner Aljaz in the final.