Why?

The most painful moment
That I ever willingly endured
Was that moment
The one where I finally gathered my courage
Looked you in the eye
And said "Good-bye"
The moment I finally ended things
Ended the pain you caused

And then you made it worse
Because you just shrugged
And walked away
And let me be the only one who cried
Everytime I saw you afterward
You were smiling

You used to say you loved me
So why am I the only one who hurts?