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LOS ANGELES, CA - JANUARY 21: Actress Lena Headey attends the premiere of Screen Gems' "Pride and Prejudice and Zombies" on January 21, 2016 in Los Angeles, California. (Photo by Jason Kempin/Getty Images)

Lena Headey and her ex- Jerome Flynn, who played Bronn in Game of Thrones, reportedly had such an ugly breakup in real life that the two couldn’t even be in the same room to film scenes together.

According to the UK Sun, Headey, who played Cersei Lannister, and Flynn had been involved in a rather tumultuous romance before the show. The two have known each other for years, having also appeared together in the 1993 UK TV series Soldier, Soldier. 

But while the exes were able to initially keep their tension quiet, their character’s storylines recently overlapped, when the Lannisters began working with Bronn. Eagle-eyed GOT fans pointed out that Cersei and Bronn never seemed to appear on screen together.

A new report says Jerome Flynn had an ugly breakup with Game of Thrones co-star Lena Headey.

Actor Jerome Flynn(Photo by Jeff Spicer/Getty Images for BFI)

According to the Sun, that wasn’t by accident, as Headey was adamant that any potential scenes between her and Flynn be altered so that she wouldn’t have to film with him.

“Lena and Jerome have not filmed together due to a bad break-up,” a source told the paper. “She appears to have a genuine hate towards him.”

The two have not been on speaking terms for years, The Sun reports, citing their 2014 breakup.

“They kept the full extent of it secret, but it was a very turbulent relationship, and it has been very awkward on set,” the source said, adding, “She has opened up to her trusted friends.”

Reps for the show and Lena Headey did not respond to The Sun‘s request for comment.