[wall_st]

This hand is kind of weird, he must have showed you a busted heart draw at the end or something ? The only other thing I can see is that he had AQ, 44 or some pocket pair that made a set on the end, but none of these really make sense so I still lean heavily on a bluff here.

That said the river fold is standard without some sort of read that he bluffs when he misses his draw (some people do this everytime). I might bet more on the turn since you picked up a few outs there, but i don't think it effects the outcome of the too much.