Good fold, or weak?

Villain was quick to call the flop bet and quick to check the turn. That coupled with his preflop raise OOP smells of Aces or Kings. This is a 10+1 of course, but I think this reasoning is still valid. Good fold or weak?

***** Hand History for Game 2759490623 *****
NL Texas Hold'em $10 Buy-in + $1 Entry Fee Trny:15985559 Level:1 Blinds(10/15) - Friday, September 23, 00:55:49 EDT 2005
Table Table 35300 (Real Money)
Seat 5 is the button
Total number of players : 10
Seat 1: Xtatt00 ( $1565 )
Seat 2: neon_city ( $720 )
Seat 3: goldyfishy ( $775 )
Seat 4: mikeml ( $345 )
Seat 5: Dannyk24 ( $895 )
Seat 6: Ramsey03 ( $920 )
Seat 7: denver20 ( $730 )
Seat 8: ChixC ( $690 )
Seat 9: xins0mx ( $590 )
Seat 10: wilbets ( $770 )
Trny:15985559 Level:1
Blinds(10/15)
** Dealing down cards **
Dealt to goldyfishy [ 8d 8h ]
ChixC folds.
xins0mx folds.
wilbets folds.
Xtatt00 folds.
neon_city folds.
goldyfishy calls [15].
mikeml folds.
Dannyk24 folds.
Ramsey03 raises [50].
denver20 folds.
goldyfishy calls [45].
** Dealing Flop ** [ 9h, 9c, 6d ]
Ramsey03 checks.
goldyfishy bets [100].
Ramsey03 calls [100].
** Dealing Turn ** [ Th ]
Ramsey03 checks.
goldyfishy checks.
** Dealing River ** [ 3d ]
Ramsey03 bets [225].
>You have options at Table 35034 Table!.
Your time bank will become active in less than 20 seconds. If you do not want it to be used, please act now.
call
goldyfishy folds.
call
Ramsey03 does not show cards.
Ramsey03 wins 560 chips