NL5 trips raised all in on river

[coordi]

Im running 30/27/4, havnt really been caught bluffing. I don't think hes seen me show a bluff and I rarely ever bet all 3 streets. Hes 23/5/2ish after 150 hands.

PokerStars No-Limit Hold'em, $0.05 BB (5 handed) Hand History Converter Tool (http://poker-tools.flopturnriver.com/Hand-Converter.php) from FlopTurnRiver.com (http://www.flopturnriver.com) (Format: 2+2 Forums)

Hero ($15.95)
BB ($13.93)
UTG ($13.74)
MP ($6.32)
Button ($4.82)

Preflop: Hero is SB with A/images/graemlins/club.gif, Q/images/graemlins/spade.gif.
UTG calls $0.05, <font color="#666666">2 folds</font>, <font color="#CC3333">Hero raises to $0.2</font>, <font color="#666666">1 fold</font>, UTG calls $0.15.

Flop: ($0.45) A/images/graemlins/spade.gif, 6/images/graemlins/club.gif, 3/images/graemlins/club.gif <font color="#0000FF">(2 players)</font>
<font color="#CC3333">Hero bets $0.25</font>, UTG calls $0.25.

Turn: ($0.95) A/images/graemlins/heart.gif <font color="#0000FF">(2 players)</font>
<font color="#CC3333">Hero bets $0.55</font>, UTG calls $0.55.

River: ($2.05) 7/images/graemlins/heart.gif <font color="#0000FF">(2 players)</font>
<font color="#CC3333">Hero bets $1.25</font>, <font color="#CC3333">UTG raises to $12.74</font>, Hero ?

[whyzze]

[ QUOTE ]
Loc: 3 barreling air

[/ QUOTE ]

Anyways. I call here. I cant fold this at nl5, he has a worse ace way more often.

However, with him showing no agression the entire hand I check the river expecting him to bet busted draws and worse aces.