Too weak on the end?

[Buzz]

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 K, K.
1 fold, Hero raises to $0.4, 2 folds, MP2 calls $0.40, 5 folds.

Flop: ($0.95) J, 6, 4 (2 players)
Hero bets $0.75, MP2 calls $0.75.

Turn: ($2.45) 9 (2 players)
Hero bets $2, MP2 calls $2.

River: ($6.45) A (2 players)
Hero checks, MP2 bets $6.45, Hero folds.

Final Pot: $12.90

[Lodogg]

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.

[dalecooper]

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.

[wylted]

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

[THaC]

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.