reraise him on the flop see how strong his hand is. The king on the turn is a scare card to me and i play it cautious from there out and I definetly dont go all in with just 2 pair on that board. A reraise on the flop would have told you alot more than a smooth call. You're behind to AK, QJ, AA, KK, TT and 66 and he showed strength on the flop but its still hard to tell. 2pair to a set is one of the hands you get paid on in hold em usually I just rebuy and say nice hand.