Trips on the flop line check

SupremaPoker - $0.2 NL (6 max) - Holdem - 5 players
Hand converted by PokerTracker 4

Hero (BTN): 80.75 BB
SB: 121.25 BB (VPIP: 53.85, PFR: 26.04, 3Bet Preflop: 6.98, Hands: 170)
BB: 17.75 BB (VPIP: 67.50, PFR: 2.53, 3Bet Preflop: 2.27, Hands: 81)
UTG: 120.75 BB (VPIP: 31.07, PFR: 20.90, 3Bet Preflop: 5.71, Hands: 181)
CO: 27.5 BB (VPIP: 64.81, PFR: 9.43, 3Bet Preflop: 4.55, Hands: 54)

SB posts SB 0.5 BB, BB posts BB 1 BB

Pre Flop: (pot: 1.5 BB) Hero has J♥ K♥

fold, CO calls 1 BB, Hero raises to 4 BB, fold, fold, CO calls 3 BB

Flop: (9.5 BB, 2 players) 7♣ J♦ J♠
CO checks, Hero checks

Turn: (9.5 BB, 2 players) 8♥
CO bets 3.25 BB, Hero calls 3.25 BB

River: (16 BB, 2 players) Q♠
CO bets 20.25 BB and is all-in, [b]

do i have a fold here?
should i have bet on the flop instead of slow playing?
my thought on the flop was that there is almost zero value to gain very dry board