Four Knocks

I hate being alone So won't you come with me To the end of time We could be together There is so much for us to see Like The Silence in the Library I will never die 'cause I can never die I don't want to go No I could do so much more You need to stay away from me It's for your own safety I was never here We were never together I don't want you around here Or anywhere around me Four knocks for me What does that mean? I don't want to go No I could do so much more He has come to face me We're the last of our kind I'm going to die Why must I die?