What do you do when someone is being 'clingy'?

He's being clingy like we're together.

I mean, we said we thought the other was attractive and I pecked him on the lips once.

We aren't together and I didn't even like him like that, so now I don't think I ever will.

...

But we're close friends (and in class together) so I can't 'ghost' him, what do you suggest?

What do you usually do in this scenario?

What do you do when someone is being 'clingy'?
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