How do you stop yourself from liking someone?

I have a close friend who is very much unavailable. I used to really like him, but we got separated by college and life, so I moved on. But now we're around each other again and I can tell I'm starting to like him again.

I'm bad at hiding when I like someone, and I don't want to cause any trouble or make him feel awkward.

How do I stop this crush before it develops?
How do you stop yourself from liking someone?
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