Raise with AK, raise after flop and get reraised. What to do?

[wyrd]

I'm curious if I played this wrong. I figured possible outs were AK5, but after I got re-raised I was unsure of the hand. An afterthought is that he may have came in with A5 and flopped a straight. However I wasn't thinking that at the time figuring he had pocket pair and may have flopped trips or overpair to the board. If I put him on pocket pair then was my fold a mistake given the pot odds? If he flopped the straight or trips then a good lay down? I'm looking for advice as to my overall play of this hand. Thanks for your time. [img]/images/graemlins/smile.gif[/img]

Party Poker No-Limit Hold'em, $ BB (9 handed) converter

MP3 ($5.1)
CO ($25)
Button ($26.3)
SB ($19.55)
BB ($26.25)
UTG ($13.35)
Hero ($29.93)
MP1 ($24.3)
MP2 ($25.15)

Preflop: Hero is UTG+1 with K[img]/images/graemlins/heart.gif[/img], A[img]/images/graemlins/club.gif[/img]. CO posts a blind of $0.25. SB posts a blind of $0.1.
<font color="#666666">1 fold</font>, <font color="#CC3333">Hero raises to $1</font>, MP1 calls $1, <font color="#666666">3 folds</font>, Button calls $1, SB (poster) calls $0.90, <font color="#666666">1 fold</font>.

Flop: ($4.50) 3[img]/images/graemlins/diamond.gif[/img], 4[img]/images/graemlins/diamond.gif[/img], 2[img]/images/graemlins/heart.gif[/img] <font color="#0000FF">(4 players)</font>
SB checks, <font color="#CC3333">Hero bets $3</font>, <font color="#CC3333">MP1 raises to $6</font>, Button folds, SB folds, Hero folds.

Final Pot: $13.50