I think this song means that even though she likes him and he doensn't like her, she is still giving hima chance to leave her to find someone else but he is staying just because he wants to hurt her. Personally I hate those kind of guys, they suck. Guys, we like you but if your going to hurt us just leave, we don't want to be hurt!
Nami-Chan ♥♥♥♥.