How do I make him stop?

I want this guy to stop texting me. he thinks we're really close but the truth is he's really annoying and clingy. lately I've just been ignoring his texts but he keeps sending more like 'hello? are you there? are you busy? can we talk later?' and it's driving me crazy! how do I tell him to buzz off without being a bitch?
How do I make him stop?
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