AJs monotone flop (too weak or standard?)

[djshawk]

This is my second orbit at the table so no reads.

I'm posting this more as a check up because I think I'm playing way too weakly and find myself in this situation loads. I was even going to check the flop but when BB folded I thought there was a good chance a bet would take it down.

In hindsight I think I should probably have bet the turn and river as SB is likely holding a lone heart.

This is ladbrokes 2/4 6-max.

Hero (CO) dealt: A[img]/images/graemlins/spade.gif[/img] J[img]/images/graemlins/spade.gif[/img]
(1 fold), MP3 called, Hero raised, (1 fold) , SB called, BB called, (1 fold)

Flop (7SB) : 5[img]/images/graemlins/heart.gif[/img] 6[img]/images/graemlins/heart.gif[/img] Q[img]/images/graemlins/heart.gif[/img]
SB checked, (1 fold), Hero bets, SB calls

Turn (4.5BB) : 5[img]/images/graemlins/club.gif[/img]
SB checked, Hero checked

River (4.5BB) : 3[img]/images/graemlins/spade.gif[/img]
SB bet, Hero folded

Comments really appreciated.