OMG the river paired the board

[Sebs]

SB is the donk of the table. His numbers are 77/33/2
BB is your standard TAG, plays a solid game

How much of a nit am I to fold in this spot? Do you put SB on a lower flush and call?

Party Poker No-Limit Hold'em, $ BB (6 handed) Hand History Converter Tool from FlopTurnRiver.com (Format: 2+2 Forums)

Hero ($269)
SB ($695.25)
BB ($217)
UTG ($200)
MP ($191)
CO ($272)

Preflop: Hero is Button with 7[img]/images/graemlins/heart.gif[/img], A[img]/images/graemlins/heart.gif[/img]. SB posts a blind of $1.
<font color="#CC3333">UTG raises to $6</font>, <font color="#666666">2 folds</font>, Hero calls $6, SB (poster) calls $5, BB calls $4.

Flop: ($24) 4[img]/images/graemlins/club.gif[/img], Q[img]/images/graemlins/heart.gif[/img], 3[img]/images/graemlins/heart.gif[/img] <font color="#0000FF">(4 players)</font>
<font color="#CC3333">SB bets $12</font>, BB calls $12, UTG folds, Hero calls $12.

Turn: ($60) 9[img]/images/graemlins/heart.gif[/img] <font color="#0000FF">(3 players)</font>
SB checks, BB checks, <font color="#CC3333">Hero bets $40</font>, SB calls $40, BB calls $40.

River: ($180) Q[img]/images/graemlins/club.gif[/img] <font color="#0000FF">(3 players)</font>
<font color="#CC3333">SB bets $70</font>, BB calls $215 (All-In), Hero folds, SB calls $89.

Final Pot: $554