How to flirt with my guy friend without being obvious to our friends?

There's a guy I'm really into, and we have a lot of the same mutual friends. I want to flirt and let him know I'm interested, but I don't want his friends to know about it. I just feel weird letting everyone know that I like him because none of our friends know that I do yet.

Should I just go for it and ignore what everyone thinks, or play it cool and try to be subtle about it?

Guys, do you have any preference?

How to flirt with my guy friend without being obvious to our friends?
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