Wow! I looked in the spoiler. That's what happens when you enter in dark tunnels...
We could look at this hand backwards and have a clearer idea, how did Hero end up at showdown with his whole stack in the pot holding total air....
if you wanted to have a try at bluffing, you ran into the stickiest calling station you could find or a superstrong reg, haha.
I don't really like bluffing on the turn. It's a highcard, ok, but he can have all flushes and you don't block anything. There are better spots for that. If you want to bluff vs. lower pairs, just check the turn and bet the river if it goes x/c. Like that you can save yourself a lot of trouble and money
As played you don't have to shove the river but can choose a smaller sizing since his callingrange should be very unelastic (he either has a
or he doesn't), 1/3 pot is fine actually
GL