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Why Bradley Cooper, Renee Zellweger Called It Quits

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Their relationship seemed rock solid, so what pushed Bradley Cooper and Renee Zellweger to their limit? Despite rumors to the contrary, a source close to 36-year-old actor tells the new issue of Us Weekly (on stands now) it wasn't another woman. 

"If I had to pick any possible mistress it would be Brad’s career," says the source. "He worked really hard to get into leading man status."

Related: PHOTOS: Hollywood's biggest splits

And it appears his efforts have paid off. Limitless, Cooper's first stint in a headlining role, took the top spot at the box office last weekend, taking in $19 million.

"Renee had to take a backseat," says the insider. "She traveled with him to make it work."

Related: PHOTOS: Stars who found love on the set

And an insider close to the Academy Award winner says that Zellweger, 41, was more than willing to try out the supporting role, even moving from New York to be closer to her man.

"She's accomplished a lot of her professional goals," says the source. "So Renee took some time out to be a great girlfriend and see if this is what it took to make a relationship work."

Related: PHOTOS: Better after break-up

Despite their concessions, the couple, who met filming Case 39 in 2006 and began dating three years later, couldn't keep things together.

Related: PHOTOS: Would Renee and Bradley have dated in high school?

"She stopped fighting," says the Zellweger insider. "It was just not working out."

For much more on Renee and Bradley's break-up, pick up the current issue of Us Weekly, on stands now.

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