Alone when im not

When you sit next to me
You feel a million miles away
I know that you love me
But i never know what to say
Your looking down
So i quickly look away
Afraid of the look in your eyes
And when you turn and gaze
A little part of me dies
My feelings melt away
I miss the way we were
Before we took that fall
Will i never get you back
Is that part of us gone
Cant we go back to before
Can we open a closed door