Honestly, I would have bet on the turn also to root out the drawers. Because you know with that kind of hand, you were a huge favorite, even on the turn. The odds of someone picking up the full house on the turn are pretty slim when there are only three players in during the flop. There was almost nothing that could have beaten your ace high straight until that bad river card. Now, if he was a crappy player or maybe low on chips instead, he may have called a large bet on the turn. Still, that's a rough beat though.