This song isn't really about Jareth declaring his love for Sarah. This is about how throughout the whole movie, he's tried winning her love and making her forget about what's truly important. In this song, he's finally saying "I've given you my everything, and all of me, but I know that's not enough, and you'll not love me. This is one last attempt. Please. Love me. It's not enough for me to live just within your memory."
This song isn't really about Jareth declaring his love for Sarah. This is about how throughout the whole movie, he's tried winning her love and making her forget about what's truly important. In this song, he's finally saying "I've given you my everything, and all of me, but I know that's not enough, and you'll not love me. This is one last attempt. Please. Love me. It's not enough for me to live just within your memory."