Taylor Swift and Jake Gyllenhaal: Why They Split

Country singer was apparently too young for movie star

Rick Diamond/Getty Images for CMT (Swift), John Shearer/WireImage(Gyllenhaal)
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So what rhymes with Gyllenhaal?

Taylor Swift, 21, may be hard at work penning her next break-up ballad — sources confirm to UsMagazine.com that she and Jake Gyllenhaal, 30, have ended their brief romance.

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"Jake reached out to her and started all of this, but now he’s not acting as interested," a source reveals in the new issue of Us Weekly (on stands Wednesday).

The previously inseparable pair called it quits just before New Year's Eve, then rang in 2011 separately.

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"He said he wasn't feeling it anymore and was uncomfortable with all the attention they got," says the insider of the just over two-month romance. "He also said he could feel the age difference. Taylor is really upset. We told her not to move so fast with this but she didn't listen."

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Explains a Gyllenhaal insider, “Jake cares about her, but [the publicity] was a lot for him. He wants to keep his private life private, and that’s hard to do dating Taylor.”