Now what?

[Roy6]

UTG was a big maniacal donkey, 70/37/1.88.
After limping preflop, I thought there's a big chance he has both hole cards < 7.
He has limp-reraised once, with A3s
BB was 55/6/1.5, very bad player chasing everything.

I don't know if I like my flop bet. I thought my hand is best here quite often. What do you do on the turn? Check behind, and call a rievr bet from UTG when it's not an overcall?

PokerStars 3/6 Hold'em (5 handed) converter

Preflop: Hero is MP with 7[img]/images/graemlins/heart.gif[/img], A[img]/images/graemlins/diamond.gif[/img].
UTG calls, <font color="#CC3333">Hero raises</font>, <font color="#666666">2 folds</font>, BB calls, <font color="#CC3333">UTG 3-bets</font>, Hero calls, BB calls.

Flop: (9.33 SB) 8[img]/images/graemlins/spade.gif[/img], J[img]/images/graemlins/club.gif[/img], 3[img]/images/graemlins/club.gif[/img] <font color="#0000FF">(3 players)</font>
BB checks, UTG checks, <font color="#CC3333">Hero bets</font>, BB calls, UTG calls.

Turn: (6.16 BB) 2[img]/images/graemlins/diamond.gif[/img] <font color="#0000FF">(3 players)</font>
BB checks, UTG checks, Hero