NL 100 AA gets raised on the flop. Is the always a fold?

[flytrap]

Opponent is 12/1, but with an AF of 6. I hate folding in spots where it would be correct to raise me with any two cards. But since my opponent probably doesn't know this, he must have the goods here most of the time right? The raise is big enough that I decide now if my hand is good. I raised out of the blind, villain has to expect that I have a big hand, and that I won't lay it down. Therefore, must I fold?

Full Tilt Poker - No Limit Hold'em Cash Game - $0.50/$1 Blinds - 9 Players - (LegoPoker Hand History Converter)

SB: $172.80
Hero (BB): $100.00
UTG: $97.35
UTG+1: $100.00
MP1: $106.45
MP2: $21.40
MP3: $12.20
CO: $97.10
BTN: $39.30

Preflop: Hero is dealt A[img]/images/graemlins/spade.gif[/img] A[img]/images/graemlins/club.gif[/img] (9 Players)
UTG folds, UTG+1 calls $1.00, 3 folds, CO calls $1.00, BTN calls $1.00, SB calls $0.50, <font color="red">Hero raises to $7.00</font>, UTG+1 folds, CO calls $6.00, 2 folds

Flop: ($17) 9[img]/images/graemlins/diamond.gif[/img] 2[img]/images/graemlins/heart.gif[/img] 4[img]/images/graemlins/diamond.gif[/img] (2 Players)
<font color="red">Hero bets $14.00</font>, <font color="red">CO raises to $38.00</font>, <font color="red">Hero ?