This song shows a back and forth between a boy and a girl. Contrary to popular belief, this song isn't a love song, but a breakup song. If you focus closely on what is being relayed, the relationship between the two is in trouble. From the man's point of view, the relationship is unstoppable and going great. From the girl's point of view, he's done so many bad things, that if he doesn't stop, there won't be a relationship left. And by the end of the song, with the last words being echoed by the girl, it seems that this relationship did in fact end.
Chris - Athens, GA