Should I fold?

[bconway6]

Info:
UTG: 66, 40, 0 (hands, VPIP, PFR)
Button: 39, 51, 7.7 (H,V,P)

Party Poker 1/2 Hold'em (10 handed) converter

Preflop: Hero is UTG+1 with Q[img]/images/graemlins/club.gif[/img], K[img]/images/graemlins/spade.gif[/img].
UTG calls, <font color="#CC3333">Hero raises</font>, <font color="#666666">5 folds</font>, Button calls, SB calls, BB calls, UTG calls.

Flop: (10 SB) 5[img]/images/graemlins/heart.gif[/img], Q[img]/images/graemlins/diamond.gif[/img], 2[img]/images/graemlins/heart.gif[/img] <font color="#0000FF">(5 players)</font>
SB checks, BB checks, <font color="#CC3333">UTG bets</font>, <font color="#CC3333">Hero raises</font>, <font color="#CC3333">Button 3-bets</font>, SB folds, BB folds, UTG calls, <font color="#CC3333">Hero caps</font>, Button calls, UTG calls.

Hero caps thinking he has the best hand and button is very possibly betting the 4-flush.

Turn: (11 BB) 3[img]/images/graemlins/diamond.gif[/img] <font color="#0000FF">(3 players)</font>
UTG checks, <font color="#CC3333">Hero bets</font>, Button calls, UTG calls.

Having avoided the heart, hero bets out again assuming the best hand.

River: (14 BB) 8[img]/images/graemlins/heart.gif[/img] <font color="#0000FF">(3 players)</font>
UTG checks, <font color="#CC3333">Hero bets</font>, <font color="#CC3333">Button raises</font>, <font color="#CC3333">UTG 3-bets</font>, Hero folds, Button folds.

Final Pot: 20 BB

Hero folds what is probably not the best hand any more. I am interested in heroes play; Is the pot too big to fold still facing a 3 bet and possiable cap? Also what you think the button may be folding.