QJo in LP against big stack

Pacific Poker, $10NL, .05/10 blinds, 9-handed

Hero has $10
Villain has $50

Hero is dealt Q[img]/images/graemlins/spade.gif[/img]J[img]/images/graemlins/diamond.gif[/img] in LP (button-2)
1 limper
Hero limps in
SB completes (big stack)
BB checks


Flop: ($.40): 2[img]/images/graemlins/heart.gif[/img]J[img]/images/graemlins/spade.gif[/img]T[img]/images/graemlins/heart.gif[/img]
BB,MP checks
Hero bets .50
SB calls, rest fold

Turn: ($1.35) 8[img]/images/graemlins/spade.gif[/img]
SB checks
Hero bets $1
SB calls

River: ($3.25) K[img]/images/graemlins/spade.gif[/img]
SB bets $2.70
Hero folds.

Too weak?

I bet into the SB twice, on the flop and turn, and he called without even thinking.

Should I have just called here? I'm having trouble putting the villain on a hand.