AKo Was this a good fold?

O.K. I'm pretty confident that my 3-bet PF was the right play but after that I'm lost. Should I have bet the flop? And after the cc on the flop was my fold the best decision?

MP1 27.45/0
MP3 18.75/12.5
Button No Info


PokerStars 0.10/0.20 Hold'em (9 handed) converter

Preflop: Hero is SB with A[img]/images/graemlins/club.gif[/img], K[img]/images/graemlins/heart.gif[/img].
<font color="#666666">2 folds</font>, MP1 calls, <font color="#666666">1 fold</font>, <font color="#CC3333">MP3 raises</font>, <font color="#666666">1 fold</font>, Button calls, <font color="#CC3333">Hero 3-bets</font>, <font color="#666666">1 fold</font>, MP1 calls, MP3 calls, Button calls.

Flop: (13 SB) 5[img]/images/graemlins/spade.gif[/img], J[img]/images/graemlins/heart.gif[/img], 7[img]/images/graemlins/spade.gif[/img] <font color="#0000FF">(4 players)</font>
Hero checks, <font color="#CC3333">MP1 bets</font>, <font color="#CC3333">MP3 raises</font>, Button calls, Hero calls, MP1 calls.

Turn: (10.50 BB) 9[img]/images/graemlins/heart.gif[/img] <font color="#0000FF">(4 players)</font>
Hero checks, <font color="#CC3333">MP1 bets</font>, <font color="#CC3333">MP3 raises</font>, Button calls, Hero folds, <font color="#CC3333">MP1 3-bets</font>, MP3 calls, Button calls.

River: (19.50 BB) 7[img]/images/graemlins/diamond.gif[/img] <font color="#0000FF">(3 players)</font>
<font color="#CC3333">MP1 bets</font>, MP3 calls, Button folds.

Final Pot: 21.50 BB