[krimson]

I think you should have check called the river instead of leading into him

c/c is no good here. Our opponent is passive so he's likely only betting the river with hands that have us beat, and checking when behind. This means we're not paying off our hands when ahead. c/c works better on more aggressive opponents where we can induce them to bluff with a worse hand, therefore we still pay off our better hand often enough to make it a +ev move.

In this hand I think we can fold to the bet, although it's somewhat marginal. It looks like hit a flush or got "tricky" with a K.