Villains like 50/0 over 10 hands, nothing concrete. I assume he's retarded until proven otherwise. Was I right to slow down just a -wee- bit on the river?

PokerStars 1/2 Hold'em (5 handed) Hand History Converter Tool from FlopTurnRiver.com (Format: FlopTurnRiver)

Preflop: Hero is BB with 8, K.
UTG calls, 3 folds, Hero checks.

Flop: (2.50 SB) 5, T, 7 (2 players)
Hero bets, UTG raises, Hero calls.

Turn: (3.25 BB) J (2 players)
Hero checks, UTG bets, Hero raises, UTG 3-bets, Hero caps, UTG calls.

River: (11.25 BB) A (2 players)
Hero bets, UTG raises, Hero calls.

Final Pot: 15.25 BB