First, I would like to say everyone deserves love, but that doesn't mean you have to marry this guy. Sometimes when we love someone and the holy spirit is telling you he's not "the one" we battle this, sorta like your situation. You don't have to stop loving him, you just have to stop the relationship from heading in whatever direction the holy spirit is telling you to not go.
Second, you are young and I know this is hard to process, but you should never have a boyfriend in this high of an altitude. Right now the only figure who should be higher than yourself is God himself. You are a daughter of our lord and a sister to the world, you owe it to God, yourself, and your world of siblings to listen to the lord, obey to his will, and walk the path he creates. What he has planned for you is unimaginable.
Third, God gave you this passionate love don't let a human destroy, alter, or damage Gods creation. You are a work of art, and God is your maker, he is going to paint what he wants, let him!
I wish you the best, take care!