This man is almost certainly your messenger. He is the main link between you and this world. Ill quote paulo coelho from his book the pilgrimage here, 'so the only way to deal with our messenger is to accept him as a friend- by listening to his advice and asking for his help when necessary, but never allowing him to dictate the rules of the game.' and 'when we become fascinated by his power, he owns us from fighting the good fight.'
the next time that you see him ask him his name, dont listen to anything he tells you until you know his name. Never tell anyone the name of your messenger as the person who knows this can invoke your messenger and destroy you.