How to get rid of a creepy texter?

This guy in my grade texts me every day! I get so sick of it. I talk to him during school sometimes, and he texts me then too! It's obvious he likes me, but I don't like him that way. And if I don't reply the first time or in the first 10 mins of him sending a reply, he sends a duplicate. If I don't answer a part of the previous text, he sends another duplicate of that one! He won't stop and I get so annoyed and I'm starting to get creeped out. He even sends me texts when I'm in bed. I woke up to one last night! I don't reply that much anymore, hoping he gets the hint that I don't want to talk to him. But I don't think he's getting it :( He sent 3 texts to me yesterday, saying I was going to watch a movie with him and his friend later. I replied to the last one saying I was busy helping my mom. He said 'Oh that sux. Wana go to town w us?' I said I was going to the game later and he wrote back 'wldnt a movie be better?' I told him I already said I was going to the game with some friends. Then later he came up to the game :( Any tips on how to get him to stop? I'm really desparate for any help!
How to get rid of a creepy texter?
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