I think this song is split into two parts. In one 'I know my heart belongs to you', i think he is talking to a new girlfriend after he broke up with the love of his life. the other, which is the whole other part of the song, he is speaking to his ex, who broke up with him because of something going on, and he knows that that killed their 'jaded love' and the only thing he wants to to is save that old love and be back together with his current ex.
I think this song is split into two parts. In one 'I know my heart belongs to you', i think he is talking to a new girlfriend after he broke up with the love of his life. the other, which is the whole other part of the song, he is speaking to his ex, who broke up with him because of something going on, and he knows that that killed their 'jaded love' and the only thing he wants to to is save that old love and be back together with his current ex.