You know I recently learnt about the above video by Evanescence. She's talking about losing her sister when she was still a little girl. But she's not saying she wanted her to leave, she's saying if she has to leave she wishes she would. So she can move on like her sister would want her to do. Because though she's still with her she's been alone all along.
My ex who is visiting for the past 2 weeks from out of the country used to sing this song. She has an amazing voice and could really belt it out just like Amy Lee.