'Back to December' lyrics are a Taylor Swift apology, but to whom?

taylor-swift-milan-2010-gi.jpg Taylor Swift may only be 20, but she already has a couple of high-profile boyfriends under her belt, including and Joe Jonas and Taylor Lautner. We'll politely ignore that nasty John Mayer rumor that was going around.

So which one is her new song "Back to December" about?

"I've never felt the need to apologize in a song before. But in the last two years I've experienced a lot, [including] a lot of different kinds of learning lessons," she tells MTV News. "And sometimes you learn a lesson too late and at that point you need to apologize because you were careless."

So, are we all going with the boy Taylor on this one? Take a look and judge for yourself: