bluff catching with second pair

Not sure you have some bet sizing tells on the villain in this hand. Without this it's tough to call with middle pair without blocking the flush.

Cheers,
SDK1987

It's a tough spot on the river. V is playing 40% of hands so I think it is likely the flush is in V's range here, but the sample size isn't the best. If V was tighter I think a call here is much easier.

I think best play is a fold and watch them for more information

As played its a check fold on river, villain is wide enough to have flushes here, he can have bluffs since you kinda gave up on turn but more likely youre behind here without having blockers

Check fold on the river - you have second pair, fluch possible.
He call the flop ... it could be some pair, A, Q .. or FD.
On the turn socond fluch possible is there and he is betting more les pot bet after your check.
He is betting pot bet river again - so he played better than you or he had better hand than you - your second pair is weak there.

On this board river is indeed a check fold.
His bets are big and on river is pot...

I think you lost the hand on the turn.

He showed low ace. A5 or something

K♠: is very bad card to have in bluff catching hand.