"I'm not the girl that can break your heart."
You easily cast me aside and pull me back when you want to. You put me on a shelf and leave me there gathering dust. You flirt with me when you're bored and you play with my emotions. You do all these and more because I'm not the girl that can break your heart.
But you ... you a re the guy that can break my heart ... and you have broken it once too many.