He didn't play you. Boethiah is the prince of deceit, not HM, so that is mere speculation on your part. He wanted the Skaal's knowledge, whatever that may have been. He never promised anything doing the MQ for DB, so there is no way to honestly say that he will or would turn on you. Miraak was obviously the one to abuse the situation and piss off a Daedric Prince.
play you as in use you, not deceit. a pawn in a chess game. what speculation is to be had when it plays out that way?
He knew what Miraak was doing all along, he just let him live and imprisoned him until HM could find a replacement. you. hook line and svcker, you think you're growing ever powerful than before but in essense you're just Mora's (censad)