[spydog]

He's not folding anything to your turn 3-bet unless he's bluffing. Your flush draw is easily disguised because he'll be more worried about a spade on the river than a heart, so you'll get 4 bets on the turn/river whether you 3-bet or call his raise and checkraise a heart river.

I just don't see much fold equity here. Maybe you are just a closet LAG.