Why?

You smiled in her face and stabbed her in the back.
You bit the hand that feeds you, ran her off the track.
She held you when you needed it, and wiped away your tears.
She wanted just to love you, and calm all your fears.
But in the end, her heart was broken.
Those three words never again spoken.
The love of her life left her alone.
The pain in her heart hard like stone.
All because you lied to her face and to other girls.
But her love wont die, for you were, and still are her world.
Why?