"A level of disrespect I didn't realize was possible"
Tl;Dr: According to the new cocktail book, Tom used "Jamie" as the code name for Rachel in his phone, which is the same name as Ariana's late father.
"The worst part is that my dad’s name was James, may he rest in peace," Madix, 38, writes. "Imagine seeing a screenshot of a text in which he tells a friend how he 'took Jamie to the mile high club.' For him to use my dad’s name for her was a level of disrespect I didn’t realize was possible."