Even after everything, I think Bojack and Herb could’ve had a friendship again if he kept visiting him. Like if he turned up again a week later and said “I’m sorry. Again. Of course you’ll never forgive me, but I did enjoy seeing you. Let’s do this more”. Then who knows, maybe after 6 months or so Herb may have genuinely forgave him.
I know someone whose middle name is J. Not Jay. J.