Unrequited love is one of the worst feelings in the world. you put all your emotions into this one person and it's like they don't even care. I suggest you stop giving him your attention, ignore him even. he'll realise how different it is, and he'll miss how it was before. that's when you know he loves you back. But you'll be the one who doesn't care this time, because he was the one who hurt you.
RedSam01