Curiosity kills
Noah and Joshua observed how Aria and Ivy threw Amber out of the ward in shock. They could not mask their surprise by the way they had dealt with the disgusting woman, who had lost all her morales. Just her mere presence was suffocating them, especially Joshua, who did not want to be bothered with her. And he had the urge to puke whenever she had addressed him as her boyfriend.
Joshua was not her boyfriend and never was. It was all a delusion he had been in after falling for Amber's schemes. He was just a use-and-throw boyfriend for her, and he realized it only after he met Ivy. Amber had never cherished him how Ivy did. She had never cared once for him. Heck! She had never even bothered to be by his side when he had fallen sick.