The Mortal Instruments Series. If you haven't read it, read this letter and you will want to. I was just reading this page in book. This made me cry. I hardly ever cry at books. I just absolutely love Clary & Jace.
"Actually, that's a lie." He whispered, so quiet that he could barely even hear it... But I heard. I knew. I knew I was the reason he still wandered into the blackest of places. Because he knew I wouldn't ever let something happen to him.