25NL- turn check raise

[canavarr]

villain is 60/16/2.5 (38 hands)
i've seen villain minraise (check raise) turn with air before, so I thought my hand could've been good. but he fired another bullet so I backed off. what is the best line here??

Full Tilt No-Limit Hold'em, $0.25 BB (6 handed) Hand History Converter Tool from FlopTurnRiver.com (Format: 2+2 Forums)

CO ($18.15)
Button ($29.15)
SB ($35.55)
Hero ($25)
UTG ($32.65)
MP ($24.65)

Preflop: Hero is BB with A[img]/images/graemlins/club.gif[/img], 5[img]/images/graemlins/spade.gif[/img].
<font color="#666666">1 fold</font>, MP calls $0.25, <font color="#666666">2 folds</font>, SB completes, Hero checks.

Flop: ($0.75) K[img]/images/graemlins/heart.gif[/img], A[img]/images/graemlins/diamond.gif[/img], 3[img]/images/graemlins/club.gif[/img] <font color="#0000FF">(3 players)</font>
SB checks, <font color="#CC3333">Hero bets $0.75</font>, MP folds, SB calls $0.75.

Turn: ($2.25) 8[img]/images/graemlins/diamond.gif[/img] <font color="#0000FF">(2 players)</font>
SB checks, <font color="#CC3333">Hero bets $1.5</font>, <font color="#CC3333">SB raises to $3</font>, Hero calls $1.50.

River: ($8.25) 9[img]/images/graemlins/spade.gif[/img] <font color="#0000FF">(2 players)</font>
<font color="#CC3333">SB bets $5</font>, Hero folds.

Final Pot: $13.25