What can I do about this creepy old man who purposely sits next to me every time I see him? I end up getting up and leaving immediately but he still?

He still sits beside me and then tries to talk to me. I have spoken to him once because he asked me a question about some papers, I answered to not be rude, then every time I saw him it’s like I’m his friend. I don’t want to be his friend, he’s creepy and he clearly doesn’t get the signal as it’s over 10 times

What can I do about this creepy old man who purposely sits next to me every time I see him? I end up getting up and leaving immediately but he still?
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