She sure didn't see it coming.
When Jake Gyllenhaal dumped Taylor Swift over the phone just before New Year's -- ending their whirlwind two-month romance -- Swift, 21, was completely blind-sided, multiple pals tell the new Us Weekly, out now.
"It was a 180-degree turn and so out of the blue," a source tells Us of 30-year-old Gyllenhaal's decision.
Explains another insider, "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."
Indeed, it was an about-face for the Love and Other Drugs actor, who was first to pursue Swift, asking his handlers in October to set them up; their first weekend together, he took her on an apple picking date in upstate New York and to a Saturday Night Live taping in NYC.
"Jake started this whole thing, but then he just stopped responding to her," another source says.
For much more on the split -- details on the devastating phone call, Swift's "very sad" demeanor at a recent event, and how her ex is bouncing right back -- pick up the new Us Weekly, on stands today.