playing suited gapped connectors, top pair on a low connected flop

[tonypaladino]

Absolute Poker 1/2 No stats on villian

Dealt to HERO [5[img]/images/graemlins/spade.gif[/img] 7[img]/images/graemlins/spade.gif[/img]]
UTG - Folds
UTG+1 - Folds
HERO - Calls
MP1 - Folds
MP2 - Folds
VILLIAN - Calls
BUTTON - Folds
SB - Folds
BB - Checks
*** FLOP *** [5[img]/images/graemlins/diamond.gif[/img] 3[img]/images/graemlins/club.gif[/img] 4[img]/images/graemlins/spade.gif[/img]] Pot=3.5 SB
BB - Checks
HERO - Bets
VILLIAN - Calls
BB - Folds
*** TURN *** [5[img]/images/graemlins/diamond.gif[/img] 3[img]/images/graemlins/club.gif[/img] 4[img]/images/graemlins/spade.gif[/img]] [K[img]/images/graemlins/heart.gif[/img]] 2.5 BB
HERO - Bets
VILLIAN - Raises
HERO - Calls
*** RIVER *** [5[img]/images/graemlins/diamond.gif[/img] 3[img]/images/graemlins/club.gif[/img] 4[img]/images/graemlins/spade.gif[/img]] [K[img]/images/graemlins/heart.gif[/img]][K[img]/images/graemlins/club.gif[/img]] 6.5 BB
HERO - Bets
VILLIAN – Calls
Final Pot: 8.5 BB

should I have let go of this hand?