My guy friend won't stop asking me out! How do I get him to stop and still be friends?

Anonymous
I'm brand new to this site, so sorry if this is posted in the wrong place!

So I have a good friend who I've known for about 3 years. In high school, he told me he had a huge crush on me and asked me out, but I turned him down as I'm not really interested in romance. He took it really well (or so I thought), but now he won't stop asking me out! I've explicitly told him no and that it's not going to happen MANY times, but he persists and thinks I'm just playing hard to get. He'll even ask me out after having just gone on dates with other girls! He's also constantly trying to hang out with me, sometimes even trying to invite himself to super personal events.

What do I do? I want to stay friends with him, but this is getting RIDICULOUS! We're also neighbors and share a big portion of our friend group, so ignoring him would be difficult if not impossible.
My guy friend won't stop asking me out! How do I get him to stop and still be friends?
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