Hero is sitting in LP with $500 stack. Table is very loose passive. Hero is on a heater and has won all pots at showdown with good and marginal hands.

2 players limp, hero bumps it to $12 with AQ, it folds to BB who flats, and both limpers call.
Villain in the BB is pretty loose, young guy in his early 20s, calling preflop raises with marginal hands such as J4s and chasing draws all the way to the river. Hero played this villain 45 minutes earlier when hero isolated a few limpers with A8s from the BTN and got flatted by V in the blinds. Flop came A59 2tone and V donked 10 into 20 and hero called. Turn came another ace, V lead again 20 into 40 and hero called. River came a blank, V lead 40 into 80, hero called and V open mucked.

Flop ($45$): AK8. Everyone checks and hero bets 30$, V in the blinds calls and other 2 players fold.

Turn ($105): 5. V checks and hero bets 70$, V calls.

River ($245): 6. Hero was listening to his music and before knowing anythig the dealer threw the all-in button in front of villain who had $300 left. Villain was looking around but stared at hero when hero looked at him. Last time when villain spewed 3 streets into hero, he was looking away from hero and avoiding eye contact.

Call or fold? My plan on the river was to check back most of the time. The fact that he was acting differently han when he spewed on me made me think he could be strong. Thoughts? Ty.

V obv has some spewy tendencies and is likely capable of bluff shoving the flush card, but what does he have that gets to the river to take that line with? I fold here this deep.

Fold. Hes offering worse than 2-1 and cant really see him bluffing here more than 1 in 3 times.

Find a fold. Like Garick mentions, there aren't many hands he's getting to the river with that he's now turning into a bluff. He likely wouldn't take this line with a value range we are ahead of.

Sighish fold ... V lead out each street in other hand. V was just laying in wait with flush draw here or chance to bluff flush River. He obv doesnt put you on flush and you cant call with less than 2 pair without very good read. Could be reverse tell with stare ... did he see you not paying attention to his action?

Maybe slightly larger Flop bet with flush draw out there, but something tells me he just wasnt going anywhere this particular hand. GL

Ez fold. Come on he was flushing

I agree that we cant see him bluffing more than once out of 3 times with our reads so far.

But about his calling range he could have QJs, QTs and JTs which looks reasonable. The rest of his range after the turn would contain Kx and Ax as hands with showdown value. So there really isn't any hands we beat when he jams as we can expect all Ax and Kx to check back and all hands we are behind of to bet, or jam, the river.

Results:

The super fast bet makes me think he doesn't have a flush, although as others have noted he may well have a hand better than TP. I would likely call because I'm sometimes a payoff wizard, although I think folding is probably the better choice.

Edit: I posted the above before reading the spoiler. The reason I thought that the fast bet meant that he didn't have the flush is because if he had caught the flush, I would imagine that he would have taken at least a moment to think about whether he wanted to push, bet less than AI, or go for the checkraise. In my experience, the insta-bet when the river brings a flush card is oftentimes an impulsive spazz bluff.

Obvious fold since you can only beat a bluff regardless of results.