Really BAD FOLD? Giving the opponent too much credit?

[insyder19]

PokerUTD 0.25/0.50, hand converted by the iPoker Converter at Talking-Poker

saw flop | [color=#C00000]saw showdown</font>

Button Atomich ($9.00)
SB Newbelief ($120.55)
BB BengtR ($34.05)
UTG paindass ($46.80)
UTG+1 SchnabelBier ($111.97)
CO [color=#C00000]Xylakant1337 ($75.70)</font>

Preflop: Newbelief is in the SB with A J
2 folds, Xylakant1337 calls 0.50, 1 fold, Newbelief raises to 2.25, 1 fold, Xylakant1337 calls 2.00.

Flop (5.50) K T A
Newbelief bets 3.00, Xylakant1337 raises to 6.00, Newbelief raises to 6.00, Xylakant1337 calls 3.00.

Turn (23.50) K
Newbelief checks, Xylakant1337 bets 9.00, Newbelief calls 9.00.

River (41.50) 6
Newbelief checks, Xylakant1337 bets 29.50, 1 fold

Xylakant1337 shows 8 A

Xylakant1337 wins 71.00 with Two pair, Ace's and King's with a Ten for a kicker

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This hand converter is kinda [censored], anyway I folded there, after it I thought I should have called because he didn't have a straight because he would have reraised it on the flop but this K really scared me because I couldn't put him on another ace.