Why'd you leave?

Sitting right opposite you
And you can't even look at me
You know how i feel
But yet you can't see

It's killing me inside
How much your hurting me
Why are you doing this?
You used to love me

I still really love you
And i will all my life
But you are constantly
Stabbing me with a knife

Every wound you make
Kills me a little bit more
I really want you to
Come back, through my door

I need you like
The air i need to breathe
I was so in love
Why did you have to leave