villain is 18/7/2 over 600 hands. i think i probably raised too loosely preflop.
PokerStars No-Limit Hold'em, $1.00 BB (8 handed) Poker-Stars Converter Tool from FlopTurnRiver.com (Format: FlopTurnRiver)

CO ($98.50)
Button ($109.40)
SB ($88.70)
BB ($10.75)
Hero ($100)
UTG+1 ($201.75)
MP1 ($25)
MP2 ($23.05)

Preflop: Hero is UTG with A, J. MP1 posts a blind of $1.
Hero raises to $5, 4 folds, Button calls $5, 2 folds.

Flop: ($12.50) 5, A, 3 (2 players)
Hero bets $7, Button raises to $14, Hero calls $7.

Turn: ($40.50) A (2 players)
Hero checks, Button checks.

River: ($40.50) 8 (2 players)
Hero bet $18, Button raised $72.40, hero?