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We weren't surprised to learn that Jake Gyllenhaal and Taylor Swift ended their two month romance just before New Year's, but sources close to the 21-year-old starlet reveal that she was "completely blind-sided" after Jake dumped her over the phone.

"It was a 180-degree turn and so out of the blue," a source tells Us Weekly. "Jake just told her it wasn't working out ... Taylor is really upset and hurt. She doesn't know what she did for him to put a stop to it. She feels really burned by him."

"Jake started this whole thing, but then he just stopped responding to her," another source added. Poor girl! Who knew Jake was such a jerk? Sigh. Make that a handsome, totally dreamy jerk...