I cannot follow you, my love
You cannot follow me
I am the distance you put between
All of the moments that we will be
You know who I am
You've stared at the sun
Well I am the one who loves
Changing from nothing to one
Sometimes I need you naked
Sometimes I need you wild
I need you to carry my children in
And I need you to kill a child
You know who I am
You've stared at the sun
Well I am the one who loves
He may be asking her to do something seemingly impossible so that she’d refuse and leave. Perhaps abortion. 
 Another meaning may be that he says he is like a child and needs someone to kill his innocence, so he can grow up to become a man.
You Know Who I Am