According to Harry's memoir, Camilla's spin doctor was responsible for
throwing him under the bus to the press over his drug use.
In "Spare," Harry writes that despite his efforts to prevent a false narrative from being published about him, his father King Charles supported the media in order to distance himself from his younger son.
Harry later learned that the same spin doctor who had leaked details of private conversations with Camilla was behind this strategy. Marko, the spin doctor, believed that the best approach was to spin Harry right under the bus.
The spin doctor saw an opportunity to appease the editor and improve Charles' reputation by presenting him as a harried single dad dealing with a drug-addled child.
This situation was unpleasant for Harry, who felt like he was being extorted and manipulated by those around him.