How do I gently let a guy down?

LovesTVDx
One of my closest friend's best friend has asked me out :/ I don't see him in that way but I do really like him as a friend. How do I let him down as gently as possible? :( I really don't want to upset him because he's pretty much opened his heart out to me :(
Updates:
+1 y
In case it wasn't clear, he's one of my best friend's friend. I'm not particularly close with him but we're in the same social group
How do I gently let a guy down?
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