Sophia Bush, Austin Nichols

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Is it safe to say that Sophia Bush is done hooking up with her costars? Or at least her costars on One Tree Hill?

The brunette beauty and Austin Nichols have called it quits after six years of dating on and off—and mostly on for the past two years, E! News has confirmed.

It would appear that, just in time for the series' swan song this spring, Bush is finally cutting herself off from the source of all of her romantic drama, both onscreen and off.

Bush dated costar Chad Michael Murray for two years, and then said "I do," but their marriage was annulled after a mere five months in 2005. Afterward, she was linked to James Lafferty, who played the half-brother of Murray's character, but her relationship with Nichols—who plays her husband on the show—was the one that had the staying power.

Until now, that is. A source told Us Weekly, which first reported the split, that "she didn't think he was the one" and was "moving on."

Aside from her role on One Tree Hill, Bush has starred in The Hitcher and John Tucker Must Die on the big screen. And she didn't take her work home with her in either of those cases.

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