Today I was player NLHE against this guy: he had been playing somewhat aggressively, but mostly a TAG. Twice he semi-bluffed with probably A-X and/or Overcards, which I was able to beat on the river and he folded, he was able to beat me twice with two moderate pairs. Here, he did something I wasn't expecting. I think I had enough equity to call, but I wussed out, as he goes all in at the river without any reason... was he bluffing, or did he have the full House ? Could you tell me why you think so, and any tips on how I could have played this hand better?

Winning Poker Network (Yatahay) - $0.25 NL (6 max) - Holdem - 6 players
Hand converted by PokerTracker 4: http://www.pokertracker.com

SB posts SB 0.4 BB, BB posts BB 1 BB

Pre Flop: (pot: 1.4 BB) Hero has 9h Kh
fold, fold, Hero raises to 2.2 BB, fold, SB calls 1.8 BB, fold

Flop : (5.4 BB, 2 players) Jh As Ah
SB checks, Hero bets 3.88 BB, SB calls 3.88 BB

Turn : (13.16 BB, 2 players) Qs
SB checks, Hero checks

River : (13.16 BB, 2 players) 3h
SB bets 116.08 BB and is all-in, fold

SB wins 12.52 BB
0.16 BB was deducted from the pot for the jackpot.