How do you let a guy down easy?

So there's this guy who I've been texting but in a friendly way because we both have common interests and he's nice and funny and I like talking to him. However, I think he might like me but I don't like him back. Because I know that sometimes I can laugh really easily, try to lift people's spirits and talk about literally anything and at any time, he might think I'm flirting when I'm trying to be nice and a good friend to him. I just don't know how to let him down easily. I would prefer to give subtle hints that I don't like him like responding later or not caring as much but I need help because I haven't really done this before because usually irl, it always works itself out. hope this makes sense.
How do you let a guy down easy?
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