> Just one final email
And if he replies with something you don't like? Or if he doesn't reply at all? What exactly do you hope to get out of this email?
My advice to you would be to write the email. Work very hard on it, and revise it several times until it's perfect. Don't send it at that stage, but go to bed.
Next morning, read it back to yourself. By then, you should not need to send it and should just be able to delete it, having got the whole thing off your chest. To sum up, I would NOT recommend sending that email but I WOULD recommend giving yourself the satisfaction of writing it and then deleting it ...