CO is 80/0/0.16

Poker Room skin
Limit Holdem Ring game
Limit: $2/$4
10 players

Pre-flop: (10 players) Hero is MP1 with
3 folds, Hero raises, 2 folds, CO calls, Button 3-bets, 2 folds, Hero Caps, CO calls, Button calls.

Flop: (13.5SB, 3 players)
Hero bets, CO calls, Button raises, Hero 3-bets, CO calls, Button calls.

Turn: (11.25BB, 3 players)
Hero bets, CO calls, Button raises, Hero calls, CO calls.

River: (17.25BB, 3 players)
Hero bets, CO raises, Button calls, Hero calls.

Results:
Final pot: 23.25BB
CO has JS3S
Hero has AHAC

Should I not have bet the river?
Should I call down with the flush draw out there?

That's awful... He called 2 cold with J3s, then called two more? Wow. He hits a 3rd-nut flush draw with middle pair on the flop, and does what a calling station does--just calls.

I'm not sure what slowed you down on the turn, but it was for the best. Seeing him raise on the river probably sunk your heart.

This guy's an idiot--first class. Only way to save another bet here is to check-call the river, but damned if I'd do that holding a set of aces.

I'm check-calling this river every time. It's safe to say that CO has a flush most of the time, but he could be one of those people who plays every ace all the way to the river. You should check-call the river.

Perflop, and flop perfect.

You MUST MUST reraise this turn to force the drawer to call 2 bets cold. In TOP they suggest raising here to give the drawer such poor odds that you are actually hoping that they call. Most weak players will call 1 BB until they are broke. Calling 2 BB a lot of time scares them and they will drop weak draws. If I was 100% sure the button would bet, I might go for a check raise to blow the CO out. That is very dangerous however in this draw heavy board. Leading out and reraising a raise is probably the better option.

I am not sure you if did anything wrong leading out on the river. Depending on your read of CO, either Bet/Call or Check/Call river when both flush and straight draws hit, I am check calling here. When reading though the hand i was saying he either had A3s or maybe a 45s. I can guess that the button had KK or QQ.