Vincent Adultman was actually a normal guy but bojack is an unreliable narrator and fudged the details so he didn’t seem like a jealous ex.

Yes I know theres an episode where Vincent Adultman and the kid seem like they are messing up when princess carolyn inviyes them over at the same time, but would it be out of the realm of possibility that Vincent Adultman was a man who was just too boring for bojack to actually listen to so he made up certain details. Seems very bojack…