Why does missing you have to hurt so much?

I feel like I'm losing ground
two steps without you
and I'm turning around
staring blankly at the place where you stood
I would call out your name
if only I could
I don't know what to do now that you are walking away
when I would never leave
and you don't want to stay
I dont know who I am, if I'm not with you
after all that time
after all we've been through
And if I said I need you, you make me thrive
would you tell me to find
some other way to survive?
Why does missing you have to hurt so much?
I keep saying I don't need you,
your voice, or your touch
but I feel like I'm losing ground
two steps without you
and I'm turning around
I would call out your name, if only I could
but I see only footprints
in the place where you stood