In my last chapter, you're everything but a shining star to be admired from afar, far from my reach and glowing brighter along the way. You'd never be my destiny and you would never knew the presence of a poem that deeply engraved the essence of you in me.
or
"In my last chapter, you are everything but — a distant star, admired from afar, glowing brighter the further you slip away from my reach. You were never meant to be my destiny, and you will never know how deeply I have etched your poetry into me."