Deception

I did not know the man behind the mask, Although our height and weight are of the same. Which led many a folk to pry and ask, Dear Sir, how do you do, speaking his name. The irony, our names were of the same. Could I perhaps be he who hides his face? For we seem to always share time and place, Yet I'm a single man and he is not. I wonder if I have fallen from grace? Living a lie and not knowing the plot!