I think once you've loved someone, you never stop loving them. You've given them pieces of yourself that eventhough are apart from your physical self, still comprise who you are. The point is you've given it to them and whatever they decide to do with that little piece of you--they might have kept it safe or chucked it out of the window--it continues to be part of you, no amount of love or neglect can change it to become something else other than yourself. That's why you keep on loving them, because you'll always love yourself.