Opponent is a good regular who's seen me running over the table the last 30 minutes. He's TAG at 19/11/ agg factor of 2.4

No Limit Holdem Ring game
Blinds: $1/$2
6 players


Stack sizes:
UTG: $186.32
UTG+1: $146.50
CO: $39.81
Hero: $598.92
SB: $368.09
BB: $838.20

Pre-flop: (6 players) Hero is Button with
2 folds, CO calls, Hero raises to $8, SB folds, BB raises to $24, CO folds, Hero calls.

Flop: ($53, 2 players)
BB bets $46, Hero calls.

Turn: ($145, 2 players)
BB checks, Hero checks.

River: ($145, 2 players)
BB bets $78, Hero calls.

Results:
Final pot: $301

How's my line?

You didn't tell us how often he 3bets, but for a TAG with this stats OOP, I would suppose that his range is TT+, AK, AQs. With this estimation of range on flop you are ahead only of 10 possible hands and lose to 25, so fold.

BUT looking at how deep you are there is an option of running a big bluff, if you raise his flop bet and bet turn (if he calls) I think he is going to fold all non set, non big draw hands, i.e. he will call only with KK, and . That's another superaggresive way to play this hand, that I like.

As played I don't like it, you were behind on flop, on turn you didn't make an attempt to represent a draw and you call river hoping that he doesn't have or , which is a very close decision here. And it's a no win situation if he bluffs here sometimes and valuebets A and K high flushes.

I fold flop I think unless I'm floating for a pot sized bluff if the 3rd spade hits on turn (which you didn't).