Relevant stats:

PokerStars - €0.02 NL (6 max) - Holdem - 5 players
Hand converted by PokerTracker 4
UTG: 40 BB (VPIP: 37.19, PFR: 18.37, 3Bet Preflop: 4.24, Hands: 694)
CO: 162 BB (VPIP: 100.00, PFR: 21.43, 3Bet Preflop: 23.08, Hands: 14)
BTN: 151.5 BB (VPIP: 53.38, PFR: 38.80, 3Bet Preflop: 6.20, Hands: 819)
Hero (SB): 104.5 BB
BB: 122.5 BB (VPIP: 18.58, PFR: 12.23, 3Bet Preflop: 4.85, Hands: 657)
Hero posts SB 0.5 BB, BB posts BB 1 BB
Pre Flop: (pot: 1.5 BB) Hero has J♠ A♣
fold, fold, BTN raises to 3 BB, Hero raises to 9 BB, fold, BTN calls 6 BB
Flop: (19 BB, 2 players) Q♦ A♥ T♠
Hero checks, BTN bets 18 BB, Hero calls 18 BB
Turn: (55 BB, 2 players) 6♥
Hero checks, BTN bets 124.5 BB and is all-in, fold
Spoiler
BTN wins 52.5 BB
PokerStars - €0.02 NL (6 max) - Holdem - 5 players
Hand converted by PokerTracker 4
BB: 40 BB (VPIP: 37.06, PFR: 18.38, 3Bet Preflop: 4.22, Hands: 700)
UTG: 48.5 BB (VPIP: 20.37, PFR: 20.11, 3Bet Preflop: 9.12, Hands: 1,171)
CO: 184 BB (VPIP: 53.83, PFR: 39.31, 3Bet Preflop: 6.56, Hands: 829)
Hero (BTN): 100 BB
SB: 39 BB (VPIP: 30.77, PFR: 23.08, 3Bet Preflop: 0.00, Hands: 13)
SB posts SB 0.5 BB, BB posts BB 1 BB
Pre Flop: (pot: 1.5 BB) Hero has A♠ Q♣
fold, CO raises to 3 BB, Hero raises to 9 BB, fold, fold, CO calls 6 BB
Flop: (19.5 BB, 2 players) 3♥ 7♦ 9♠
CO checks, Hero bets 14.5 BB, CO calls 14.5 BB
Turn: (48.5 BB, 2 players) 8♣
CO checks, Hero checks
River: (48.5 BB, 2 players) 8♠
CO bets 23.5 BB, fold
Spoiler
CO wins 46.5 BB
Longstory short, guy OR every position, then call 3 bet a lot. Then bets hard, shot three barrels and doesn't mind to go to showdown with middle pair or draw completed board.
What to do?