Sophia Bush Splits With One Tree Hill Costar Austin Nichols

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 Stefanie Keenan/WireImage.com

One Tree Hill is nearing its long-awaited series finale — and not a moment too soon for CW star Sophia Bush, 29.

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The actress has split with her on-and-off beau of six years, Austin Nichols, 31 — the third guy she's dated from the just-wrapped TV hit — a source tells the new issue of Us Weekly (on stands Friday).

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Bush broke it off with Nichols (who plays her husband) "because she didn't think he was the one," explains a source. "She's moving on."

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The actress was wed to Chad Michael Murray in 2005 and dated James Lafferty in 2009. The final episode of One Tree Hill airs April 4 on The CW.

Tell Us: Are you surprised Sophia Bush and Austin Nicols are over?

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