NLCASH Nut flush on paired board

[PureDiesel]

Villain is descent, no much of history:
Game #6026510944: Hold'em NL ($0.25/$0.50) - 2007/10/25 - 01:12:32 (UK)
Table "Nanjing" Seat 2 is the button.
Seat 1: Danger999 ($50 in chips)
Seat 2: boostmybr ($86.45 in chips)
boostmybr: posts small blind $0.25
Danger999: posts big blind $0.50
----- HOLE CARDS -----
dealt to boostmybr [A [img]/images/graemlins/diamond.gif[/img] 2 [img]/images/graemlins/diamond.gif[/img]]
boostmybr: raises to $1.50
Danger999: calls $1
----- FLOP ----- [5 [img]/images/graemlins/diamond.gif[/img] J [img]/images/graemlins/diamond.gif[/img] J [img]/images/graemlins/spade.gif[/img]]
Danger999: checks
boostmybr: bets $2
Danger999: calls $2
----- TURN ----- [5 [img]/images/graemlins/diamond.gif[/img] J [img]/images/graemlins/diamond.gif[/img] J [img]/images/graemlins/spade.gif[/img]][6 [img]/images/graemlins/diamond.gif[/img]]
Danger999: bets $3.50
boostmybr: calls $3.50
----- RIVER ----- [5 [img]/images/graemlins/diamond.gif[/img] J [img]/images/graemlins/diamond.gif[/img] J [img]/images/graemlins/spade.gif[/img] 6 [img]/images/graemlins/diamond.gif[/img]][8 [img]/images/graemlins/heart.gif[/img]]
Danger999: checks
boostmybr: bets $13
Danger999: raises to $43 and is all-in
boostmybr: calls $30
----- SHOW DOWN -----
Danger999: shows [5 [img]/images/graemlins/club.gif[/img] J [img]/images/graemlins/club.gif[/img]] (A Full House, Jacks full of Fives)
boostmybr: shows [Ad 2d] (A Flush, Ace high)
Danger999 collected $99 from Main pot
----- SUMMARY -----
Total pot $100 Main pot $99 Rake $1
Board [5d Jd Js 6d 8h]
Seat 1: Danger999 (big blind) showed [5c Jc] and won ($99) with A Full House, Jacks full of Fives
Seat 2: boostmybr (small blind) showed [Ad 2d] and lost with A Flush, Ace high
****HAND ENDS****

Is it a cooler? Is there ANY chance that i should fold to river shove, because of my underepresentation?