How can I not hurt him?

There's this guy that I've had several years of history with, we've dated a couple of times and have had our ups and downs. He is 15 and we still talk. He's done some things that I know I can never forgive him for and he thinks I already have. He knows everything about me and I know everything about him. I let him in too far and now he loves me I mean it he truly loves me, and it's all my fault for not stopping him, I just don't feel those butterflies anymore, I don't want to hurt him, but I don't love him anymore. What should I do?
How can I not hurt him?
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