I love this song even tho it makes me so sad everytime I listen to it. I feel exactly like nick cuz I did the same to my ex bf. I'm so sorry to him.
I think this song is about nick sayin sorry to miley for being a bad bf. He never thought it would be really over. And he wants to be with her, but she is already gone, but she still loves him too tho, as everyone can see on the song 7 Things by Miley.