Party Poker No-Limit Hold'em, $ Hero (7 handed)

UTG ($16)
MP1 ($63.9)
MP2 ($28)
CO ($51)
Button ($63.35)
SB ($49.65)
Hero ($50)

Preflop: Hero is BB with , . SB posts a blind of $0.25.
UTG raises to $1, 3 folds, Button calls $1, 1 fold, Hero calls $0.50.

Flop: ($3.25) , , (3 players)
Hero bets $3, UTG folds, Button calls $3.

Turn: ($9.25) (2 players)
Hero bets $8, Button calls $8.

River: ($25.25) (2 players)
Hero checks, Button bets $10, Hero folds.

Final Pot: $35.25

Results in white below:
Button doesn't show.
Outcome: Button wins $35.25.

I think I would call that river bet. Im not sure what he has but it could easily be a busted flush draw or something like A9/K9.

He didnt raise the turn so I dont think he has a set.

Youre getting 3.5:1. I think you shouldve called.

I would definitely bet something on the river, at least a $5. He raised UG, so I would think he has an overpair or an AK flush draw. I would be surprised if he has the straight after raising UG, but a TT is possible.