How can I let him down?

I found out by couple of people that he likes me. I dont like him. Should I wait for him to ask me so I can let him down or should I just come up to him and be like "ik u like me but I only want to be friends"? Because I can't keep up acting like we are friends when I know he likes me. Is like I'm waiting for him to build up courage only to get rejected. And I read somewhere that the sooner u let a guy down the better it is for his feelings so he can move on.

So what should I do? Wait for him to tell me he likes me and then reject him, while I pretend that nothing is going on and feel awkward cuz I know he likes me?
Or be direct and tell him I dont like him even if he didn't told me yet?
How can I let him down?
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