I need to tell you the story of this hand first to put you in context.
This red player Narcisuss is a Agro Reg that has declared the war on me.
He is the best player I've faced so far on NL2 since he has a similar style than mine.
We had history together.
We've played a couple hundred hands together and we have been playing daily non stop these days.
He seems to be chasing me everywhere lol.
What I know from his game is that he loves to 3 bet a lot, not always Cbets and prefers to check behind sometimes.
He plays great ranges from all positions.
He is aggressive whenever he plays and can bluff if he detects weakness.
He is one of the few regs who can overbet bluff or overbet with nuts on the river too.
2 days ago, I did a hero call on him with A High and caught him overbet bluffing $0.5 on the river.
Since that point the war was declared.
He tilted so much after that hand that he wrote in the chat:
"The worst fish ever. Such a pure whale"
And he quited the table.
Since that point I knew he was going to seek revenge and specially since he thinks I'm a whale haha.
So now we're in today's hand.

One of the leaks I'm detecting in my game, is that I 3bet/Cbet then I have to check turn if I don't have a strong hand.
Sometimes I keep the 2nd barrel as a semibluff but in this scenario, I thought it was better to do a check behind.
Now, against a fish most of the times they don't detect this and they're just playing their hands.
Sometimes they can float you with a gutshot too, but they play passively afterwards.
But against players as Narcissus, who can detect that weakness and exploit it, I knew I was showing an opening.
So I decided to just call turn and see what he did on the river.
I thought he could made that move on the turn easily with a A♣: or Q♣: so I called.
Then on the river he overbets shove.
Now, I think this could be a stone cold bluff, the nut flush who wants to extract max value or a full house/poker.
I thought about it for 1 minute, but I couldn't find the hand he could be bluffing with and I decided to let it go.
Then he flashed the cards.
After that he has been calling me in other tables my 2 barrels OOP lightly and he has even called my value bets lightly on the river too.
My question is.
Against an agro reg like this who has declared the war on you.
How do you extract the most value out of him?
I think his ego is his weakness.
And also he has anoter huge disadvantage.
Most likely he is a young guy playing on his own thinking he is the best.
But he doesn't have the Pokerstrategy community backing him up.
So how would you play against this agro reg and extract the most value from him?