Only three hands beat you. Also I find that virtually no one will check in early position with a monster hand on the river. Looks to me like he was drawing at athe club flush and missed. Most likely a suited Ace or King with a shitty kicker. I'd put in a value bet here and even if he raises all in I'd prolly call.

Then again PokerTracker Rates me as an ULTRA-AGGRESSOR for 6max so perhaps I'm wrong.