Villain is definitely loose with his calling pre-flop. I thought he was fishy at first, but seems to be coming back to normal-like numbers.

$1/$2 No Limit Holdem
5 players
Converted at weaktight.com

Profiles and Stacks:
37.0/6.5/4.3 (46) UTG ($308.40)
20.8/8.3/4.0 (48) Hero ($226.15)
30.0/26.0/7.0 (50) BTN ($447.45)
60.0/14.0/1.3 (50) SB ($555.35)
22.0/14.0/3.5 (50) BB ($248.95)

Pre-flop: ($3, 5 players) Hero is CO
1 fold, Hero raises to $7, BTN calls $7, 2 folds

Flop: ($17, 2 players)
Hero bets $15, BTN calls $15

Turn: ($47, 2 players)
Hero bets $40, BTN calls $40

River: ($127, 2 players)
Hero checks, BTN bets $127, $127 to Hero ($164.15)?