I think that hes saying that hes still in love with this girl who doesn't love/want him anymore but hes already so far into it that he can't get back out even if he wanted to. Once she gave his life so much meaning, now that shes gone he doesn't feel hes got any meaning left at all. All he wants is to give her all his love. But he knows that he can no longer do that so he wishes his pain would die like their love did.