Too weak on the end?

Here's a scenario I'm having problems with. Was this a good fold on the end or too weak,. Villian was vey agressive with 50% VPIP and 25% PFR, who went on to a big stack both by inducing folds but also showing down great hands, he seemed to be an aggressive player with a good run of cards happening.

Ultimate Bet No-Limit Hold'em, $.10 BB (10 handed) Hand History Converter Tool from FlopTurnRiver.com (Format: FlopTurnRiver)

MP2 ($9.90)
MP3 ($14.40)
CO ($4.45)
Button ($7.35)
SB ($8.61)
BB ($8.30)
UTG ($8.25)
Hero ($10)
UTG+2 ($10.70)
MP1 ($10.48)

Preflop: Hero is UTG+1 with Khttp://www.flopturnriver.com/phpBB2/...iles/heart.gif, Khttp://www.flopturnriver.com/phpBB2/...iles/spade.gif.
1 fold, Hero raises to $0.4, 2 folds, MP2 calls $0.40, 5 folds.

Flop: ($0.95) Jhttp://www.flopturnriver.com/phpBB2/...iles/spade.gif, 6http://www.flopturnriver.com/phpBB2/...es/diamond.gif, 4http://www.flopturnriver.com/phpBB2/...es/diamond.gif (2 players)
Hero bets $0.75, MP2 calls $0.75.

Turn: ($2.45) 9http://www.flopturnriver.com/phpBB2/...iles/heart.gif (2 players)
Hero bets $2, MP2 calls $2.

River: ($6.45) Ahttp://www.flopturnriver.com/phpBB2/...miles/club.gif (2 players)
Hero checks, MP2 bets $6.45, Hero folds.

Final Pot: $12.90

Bet the river next time. Checking against an aggressive player is a green light to steal the pot. More than likey he didn't catch that Ace. If he comes over the top then fold.

You rolled over to the first scare card that came along, and it wasn't really that scary. I'd bet $2 or $3 there and if he raises, it's a pretty easy fold. You have to employ blocking bets pretty regularly against this type of player.

i would have bet half the pot on the river and even call a significant raise on the river he is unlike ly playing the ace maybe he has a king jack of diamonds and he was playing that you probably had him beat dont try to make a bunch of great laydowns u r probably being bluffed out of a lot of pots

Yah, looks like a missed flush draw, but it could be Axs, I just don't think you have to worry about that enough for you to lay it down.