Only been at the table one orbit, so villain is unknown. Turn action?

PokerStars No-Limit Hold'em, $1.00 BB (6 handed) Hand History Converter Tool from FlopTurnRiver.com (Format: FlopTurnRiver)

UTG ($20)
MP ($150.25)
CO ($129.50)
Hero ($100)
SB ($101.50)
BB ($40.75)

Preflop: Hero is Button with J, J. UTG posts a blind of $1.
UTG (poster) checks, 1 fold, CO calls $1, Hero raises to $6, SB calls $5.50, 1 fold, UTG folds, CO calls $5.

Flop: ($20) 8, 3, 5 (3 players)
SB checks, CO checks, Hero bets $14, SB calls $14, CO folds.

Turn: ($48) A (2 players)
SB bets $25, Hero folds.

Final Pot: $48

I think thats really all you can do. He probably floated you with an ace, or a flush draw. You can't call down without a read IMHO

bet closer to the pot on the flop, like 17 or 18. once he bets out the turn, you are usually beat here, so yeah without a read, fold is probably good.

I think the A hit his hand. You might have one clean out. Fold.

He had the nut flush draw on the flop. 'nough said.