The meaning is whatever this song means to you. There's no correct or in correct meaning because it's your opinion. As long as you can pull quotes from the song that support your interpretation. For example you wouldn't be able to prove this song is about dog crap haha. I agree with spellingfaith. But it's not just jealousy. It's also the pain of not having her which is what the shackled to my chest part is about. Cuz that would be pretty painful haha.