10NL damn i'm overplaying AK

[ledders07]

no read on villain other than he limped called pf in this hand so he ain't the greatest obv.

i put him on A x throughout. i know my play is pretty bad but where exactly did i go wrong?

Party Poker
No Limit Holdem Ring game
Blinds: $0.05/$0.10
8 players
Converter

Stack sizes:
UTG: $4.27
UTG+1: $4.65
MP1: $1.85
MP2: $12.21
CO: $10.96
Button: $1.65
SB: $3.94
HERO: $11.62

Pre-flop: (8 players) HERO is BB with A[img]/images/graemlins/club.gif[/img] K[img]/images/graemlins/diamond.gif[/img]
3 folds, MP2 calls, 2 folds, SB calls, <font color="#cc0000">HERO raises to $0.5</font>, MP2 calls, SB folds.

Flop: 6[img]/images/graemlins/club.gif[/img] A[img]/images/graemlins/heart.gif[/img] 3[img]/images/graemlins/heart.gif[/img] ($1.1, 2 players)
<font color="#cc0000">HERO bets $0.7</font>, <font color="#cc0000">MP2 raises to $1.4</font>, <font color="#cc0000">HERO raises to $3.5</font>, MP2 calls.

Turn: 4[img]/images/graemlins/heart.gif[/img] ($8.1, 2 players)
<font color="#cc0000">HERO bets $3.1</font>, MP2 calls.

River: 5[img]/images/graemlins/spade.gif[/img] ($14.3, 2 players)
<font color="#cc0000">HERO is all-in $5.32</font>, MP2 calls.

Results:
Final pot: $24.94
<font color="#ffffff">MP2 balance 22.93 bet 11.62 collected 22.34 net 10.72 6d As </font>
<font color="#ffffff">HERO balance 0 lost 11.62 Ac Kd </font>

thoughts on flop 3-bet?
should i have given up on river?