What would you do if your guy friends think you are a couple with your female friend?

This guy friend of mine and I are close but we're really just friends only. I like him and he knows that but he told me he doesn't feel the same way. His guy friends still refer to us as a couple and tease us a lot for being together as if we're together.

I noticed he either just looks down and sometimes smiles and blushes when his friends or my friends refer to us as a couple. Either ways he doesn't deny them at all but remains silent. So, guys shouldn't he correct them if he doesn't feel? How would you react if you were in his place?
This has happened like 20 times and he never corrected them in front of me.
What would you do if your guy friends think you are a couple with your female friend?
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