(11) folded a nut flush draw

at what point (generally and specifically to this hand) do you stop chasing draws?

***** Hand History for Game 3014545814 *****
NL Texas Hold'em $10 Buy-in + $1 Entry Fee Trny:17298409 Level:1 Blinds(10/15) - Thursday, November 10, 15:59:04 EDT 2005
Table Table 67817 (Real Money)
Seat 6 is the button
Total number of players : 9
Seat 6: texasdk111 ( $800 )
Seat 8: flipya27 ( $1040 )
Seat 9: luckylady19 ( $600 )
Seat 5: JDB1998 ( $1595 )
Seat 4: phenom78 ( $815 )
Seat 10: tskjersaa ( $790 )
Seat 7: Zbeldino ( $785 )
Seat 2: checkraiseAA ( $785 )
Seat 3: TexxMexx ( $790 )
Trny:17298409 Level:1
Blinds(10/15)
** Dealing down cards **
Dealt to Zbeldino [ As 2s ]
luckylady19 folds.
tskjersaa calls [15].
checkraiseAA calls [15].
TexxMexx folds.
phenom78 folds.
JDB1998 calls [15].
texasdk111 calls [15].
Zbeldino calls [5].
flipya27 checks.
** Dealing Flop ** [ 4s, 8s, Qc ]
Zbeldino bets [60].
flipya27 folds.
>You have options at Table 66773 Table!.
tskjersaa raises [120].
checkraiseAA folds.
JDB1998 folds.
texasdk111 calls [120].
Zbeldino calls [60].
** Dealing Turn ** [ 6h ]
Zbeldino checks.
tskjersaa bets [100].
texasdk111 calls [100].
Zbeldino folds.