Bad call on the flop? Bad check on the turn? Bad bet on the river? Bad fold on the river? It's all bad? let me know.

Full Tilt No-Limit Hold'em, $0.25 BB (9 handed) Full-Tilt Converter Tool from FlopTurnRiver.com (Format: FlopTurnRiver)

UTG ($64.80)
UTG+1 ($31.15)
MP1 ($7.55)
MP2 ($4.65)
MP3 ($23.80)
CO ($5)
Button ($24.70)
Hero ($19.40)
BB ($10)

Preflop: Hero is SB with K, K.
UTG calls $0.25, 4 folds, CO checks, 1 fold, Hero raises to $1.35, 1 fold, UTG calls $1, CO folds.

Flop: ($3.10) J, 8, 3 (2 players)
Hero bets $1.25, UTG raises to $2.5, Hero calls $1.25.

Turn: ($8.10) 8 (2 players)
Hero checks, UTG checks.

River: ($8.10) 3 (2 players)
Hero bets $3, UTG raises to $14.5, Hero ???