AA on 25NL

[Rudager]

Dealt to Hero [ Ad Ac ]
tigs217 folds.
Keizer_Soze checks.
Solklar folds.
knets has joined the table.
mtlkneeco raises [$1.5].
bomboclat folds.
mattmick folds.
shermjack folds.
ldezzo folds.
Hero calls [$1.25].
Keizer_Soze folds.
** Dealing Flop ** [ 8h, 2c, 6c ]
Hero checks.
mtlkneeco bets [$3.25].
Hero raises [$8].
mtlkneeco calls [$4.75].
** Dealing Turn ** [ 8c ]
Hero is all-In [$15.15]
mtlkneeco calls [$15.15].
** Dealing River ** [ 4s ]
Hero shows [ Ad, Ac ] two pairs, aces and eights.
mtlkneeco shows [ 4c, Kc ] a flush, king high.
mtlkneeco wins $47.2 from the main pot with a flush, king high.

Should I have bet half the pot on the turn and folded to a raise?
I thought I would have protected myself from a flush with my check-raise on the flop.