How to tell a guy with Aspergers to leave me alone?

There's this guy from one of my classes who makes me uncomfortable. The first time I spoke to him he was alright, but after a while he started to annoy me. He would always ask me about what me and my boyfriend are doing or anything about my personal life. So far, I've tried ignoring him, but he would still try and talk to me. I even told him that I don't want to talk to him and later that day he still tried to talk to me. How can I get rid of him?
How to tell a guy with Aspergers to leave me alone?
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