i still say raise the flop and he won't buy it, even good players get tripped up sometimes. it is likely you have a pocket pair, not obvious, and he will put in money. the flop is the place to make a good player think you flopped a weak hand and get him more committed than he wants to be. you could've gotten more out of this guy, and i'd rather bet too much and have him fold than allow him to get out of the hand so cheaply I don't make my odds.

however, if you are up against someone who you feel won't pay you off even with aces, then i say go ahead and fold, i just don't really think i'd run into that situation very much.