Hand Posting - A3s on the Button SH

[runningmarvel]

Hi guys,
I have a slight problem with this hand and didn't find an already posted one which seemed to look like mine.
Villain just sat down so no big reads so far, but has been calling with just about everything preflop and been betting & raising like a madman on the flop and postflop also with little so far (i.e.: TPNK, high card).
I myself think I played well too passively especially preflop. After the lead-out of villain on the flop I thought I was in front and raised, after his reraise I fell into calldown-mode, especially after the A on the turn falling and couldn't let go.
What do you think of this hand?
I would be grateful for any advice on this.
Cheers,
Jonathan

PokerStars 0.05/0.10 Hold'em (5 handed) Hand History Converter Tool from FlopTurnRiver.com (Format: 2+2 Forums)

Preflop: Hero is Button with 3[img]/images/graemlins/club.gif[/img], A[img]/images/graemlins/club.gif[/img].
<font color="#666666">2 folds</font>, Hero calls, SB completes, BB checks.

Flop: (3 SB) 5[img]/images/graemlins/club.gif[/img], 3[img]/images/graemlins/spade.gif[/img], 5[img]/images/graemlins/spade.gif[/img] <font color="#0000FF">(3 players)</font>
<font color="#CC3333">SB bets</font>, BB folds, <font color="#CC3333">Hero raises</font>, <font color="#CC3333">SB 3-bets</font>, Hero calls.

Turn: (4.50 BB) A[img]/images/graemlins/spade.gif[/img] <font color="#0000FF">(2 players)</font>
<font color="#CC3333">SB bets</font>, Hero calls.

River: (6.50 BB) Q[img]/images/graemlins/diamond.gif[/img] <font color="#0000FF">(2 players)</font>
<font color="#CC3333">SB bets</font>, Hero calls.

Final Pot: 8.50 BB

Results in white below: <font color="#FFFFFF">
SB has Js 2s (flush, ace high).
Hero has 3c Ac (two pair, aces and fives).
Outcome: SB wins 8.50 BB. </font>