Party Poker No-Limit Hold'em, $ Hero (10 handed) Hand History Converter Tool from FlopTurnRiver.com (Format: FlopTurnRiver)

saw flop|saw showdown

MP2 ($5.12)
MP3 ($21.70)
CO ($69.59)
Button ($28.35)
SB ($15.27)
Hero ($26.60)
UTG ($29.15)
UTG+1 ($8.15)
UTG+2 ($25)
MP1 ($19.33)

Villain is Loose-Aggressive/Passive.

Preflop: Hero is BB with K, J. SB posts a blind of $0.10.
UTG calls $0.25, 4 folds, MP3 calls $0.25, CO raises to $0.75, 1 fold, SB (poster) calls $0.65, Hero calls $0.50, UTG calls $0.50, MP3 calls $0.50.

I'd been trying to tighten up in the blinds and first 5 positions recently;but with a couple callers before me I've got pot odds to call to see a flop.I figure if I miss I can dump this quickly;and if I hit I can look to win a big pot.

Flop: ($3.75) 8, J, 7 (5 players)
SB checks, Hero bets $3, UTG calls $3, MP3 folds, CO folds, SB folds.

I was deciding between a CR or lead out bet;but with a draw heavy board and OOP I decide to lead out.If I'm called I can reevaluate on the turn,and if they all fold I'll take the pot.UTG calls me so we take the turn heads up.

Turn: ($9.75) 8 (2 players)
Hero checks, UTG checks.

I check to see what villain does.If he checks I can bet out the river and if he bets out I can dump this.He checks behind.

River: ($9.75) 3 (2 players)
Hero bets $4, UTG raises to $10, Hero folds.

Final Pot: $23.75

I valuebet my Jack;but villain pops me back.I don't see how the 3 could've helped him;so either he was sandbagging me with the straight;or he has the two pair/trips/boats.I decide to lay it down.

Thoughts on all streets are welcome.Was my turn check a signal for him to bluff raise the river?Or was he trapping me back?Does anyone consider a flop CR to give more info?B/c if he cold calls my flop CR(presuming the original PFR c-bets) then what is my move on the turn and river then?