Just talk straightly that you are shady he will ask what do you mean then clear him.
How can you tell if a guy is being shady ? And what should you do
I agree with Arthur. My Spidey Senses start to go off , don't pay so much attention to what he says - pay attention to what he does and how he treats other people. Just the fact that you are already suspious should tell you something. Be safe.
