(3/6) 4-flush board, how often is he bluffing?

[Paul B.]

Villain is color-labeled blue on FTP, means he's a poor player. I don't have notes on him nor have I picked up any specific reads but he seems a bit weak. Plays like 34/17 preflop.

Full Tilt Poker, $3/$6 NL Hold'em Cash Game, 5 Players
LegoPoker Hand History Converter

CO: $630
BTN: $657
Hero (SB): $759.10
BB: $572.85
UTG: $600

Pre-Flop: 5[img]/images/graemlins/heart.gif[/img] 5[img]/images/graemlins/club.gif[/img] dealt to Hero (SB)
3 folds, Hero calls $3, <font color="red">BB raises to $12</font>, Hero calls $6

Flop: ($24) 5[img]/images/graemlins/spade.gif[/img] 3[img]/images/graemlins/spade.gif[/img] T[img]/images/graemlins/spade.gif[/img] (2 Players)
Hero checks, <font color="red">BB bets $24</font>, <font color="red">Hero raises to $96</font>, BB calls $72

Turn: ($216) 4[img]/images/graemlins/spade.gif[/img] (2 Players)
Hero checks, <font color="red">BB bets $60</font>, Hero calls $60

River: ($336) 9[img]/images/graemlins/heart.gif[/img] (2 Players)
Hero checks, <font color="red">BB bets $90</font>, Hero curses

The pot-call flop and small bets on the turn and river SCREAM strength but I only have to be good on the river 1 out of 5 times. Call or fold? OR SHOVE?!?