[geormiet]

I check. He doesn't have a particular reason to assume you have a K (i.e. you didn't raise pf) and therefore that "scare card" which isn't so much of a scare card will not cause him to fold a pair - not that it's likely that he's paired anyway based on his play so far.

He could easily have spades, and since you beat most spade draws, don't bet the river.