Hi Guys, little bit of history to go with this. Villain is 30/13/0 currently over a small sample (40), c-betting 50%.

He has been defending his BB quite frequently and has check-raised my c-bets twice so far, at least one of those times was with air. This is the first time he has 3 bet me.

Pretty good flop for me but I was a bit surprised at not facing a c-bet, maybe he thought the board hit my range pretty well, maybe he had nothing, maybe he was pulling out the old c/r ploy again. I was torn between betting it and checking behind but in hindsight I think I prefer betting it.

Turn changes nothing unless he 3 bet me with 55, half pot bet, call.

River bet is really big and it confused me enough to fold because it felt like a straight although I'm not sure how many 9s are in his 3bet range. I don't think it's a busted flush draw because he should have c-bet that and I don't know if he can comfortable bet that big with a set on a 4straight board.

Thoughts please!