How do I remove myself from my friend's "Close friends" list?

Like I said, is it possible to do it?

We're just friends from the same class, and when we were sitting next to each other and I posted a status, it popped out on his screen as a notification.

Normally I don't care about it, but it's kinda creepy this time because we were never "good" friends, but we talked and hang out few times.

How do I remove myself from my friend's "Close friends" list?
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