Finally hit 300BB's at 1/2 limit, need advice on one hand

[QWIKSNK]

I finally hit $600 in my party poker account, im pretty happy. Today was rough though, there were alot of ups and downs.

here is one hand, not sure how I was supposed to play this. By the river, I thought, he had KK, but had to pay it off.

Party Poker 1/2 Hold'em (9 handed)

Preflop: Hero is MP1 with , .
1 fold, UTG+1 raises, Hero 3-bets, 5 folds, BB calls, UTG+1 calls.

Flop: (9.50 SB) , , (3 players)
BB checks, UTG+1 bets, Hero raises, BB calls, UTG+1 3-bets, Hero caps, BB calls, UTG+1 calls.

Turn: (10.75 BB) (3 players)
BB checks, UTG+1 bets, Hero raises, BB folds, UTG+1 3-bets, Hero caps, UTG+1 calls.

River: (18.75 BB) (2 players)
UTG+1 bets, Hero raises, UTG+1 3-bets, Hero caps, UTG+1 calls.

Final Pot: 26.75 BB

He won with Kings over 3's

[EscapePlan9]

[The Golden 1]

[QWIKSNK]