NL10 - What should I have done?

[nebuer]

$0.05/$0.1 No Limit Holdem
6 players
Converted at weaktight.com

Stacks:
UTG (<font color="#0000cc">$9.05</font>)
Hero (<font color="#0000cc">$9.45</font>)
CO (<font color="#0000cc">$13.47</font>)
BTN (<font color="#0000cc">$1.69</font>)
SB (<font color="#0000cc">$15.75</font>)
BB (<font color="#0000cc">$2.04</font>)

Pre-flop: ($0.15, 6 players) Hero is UTG+1 9[img]/images/graemlins/heart.gif[/img] 9[img]/images/graemlins/club.gif[/img]
UTG calls $0.1, <font color="#cc0000">Hero raises to $0.5</font>, <font color="#777777">4 folds</font>, <font color="#cc0000">UTG raises to $0.8</font>, Hero calls $0.4

Flop: A[img]/images/graemlins/club.gif[/img] 4[img]/images/graemlins/diamond.gif[/img] 2[img]/images/graemlins/diamond.gif[/img] ($1.85, 2 players)
UTG checks, <font color="#cc0000">Hero bets $1</font>, UTG calls $1

Turn: K[img]/images/graemlins/club.gif[/img] ($3.85, 2 players)
UTG checks, <font color="#cc0000">Hero bets $3</font>, UTG calls $3

River: 5[img]/images/graemlins/heart.gif[/img] ($9.85, 2 players)
UTG checks, Hero checks

Final Pot: ($9.46)


When he kept checking I was thinking he might've been on a flush draw with two diamonds up there, though now I think about it I shouldn't have been betting that strongly with A and K up there after he reraised preflop. What should I have done?