Why?!?!?!

It's not true,
It can't be,
It was always just you and me,
You're not leaving,
It will be OK,
We'll be best friends until our last day,
I need you,
Even if you don't need me,
Are you too blind to see?
Why would you to this,
When you know you'll be so badly missed,
How could you hurt the one you mean the most to?
When their whole life revolves around you?
Why?
I will never say good-bye,
Because I need you,
For every second I live,
I gave you all I had to give,
And more,
I miss the way you were before,
I want you to stay,
I need you to stay,
You can't just go away,
Because I can't live without my best friend by my side,
I don't know how I'll stay alive,

Please say you'll leave another day
Just tell me it'll be OK