How to unlike someone?

When you like someone but you have to unlike them cuz for some reasons e. g. treating you like a shit, they'll never like you back/you're just a friend to them, they don't even know you, etc. I know some or a lot of people would find it hard or it'd hurt them cuz they're forcing their feelings to stop making them like their crushes. But how to unlike someone easily?
How to unlike someone?
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