The song ‘Back To December’ is an apology.
You know… in life you learn lessons.
And sometimes you learn them the hard way, and sometimes you learn them too late.
And the song ‘Back To December’ is about a lesson I learnt too late.
And I think when you do that, and you finally realised you were wrong,
you need to say you’re sorry.

Taylor Swift

(so basically this song is not only about love. It can be universal. People hurt each other in many ways and what Taylor is trying to tell through this song is that when you realised your mistakes towards people, you should at least say “sorry”. So stop judging her music.)