Honestly, he's just such a bastard. He basically cheats on her despite how much she's given up for him but when he breaks up with her he doesn't even tell his parents and he just assumes everything will be alright. Like yes, they'd want to see her, especially because they still think she's your girlfriend.
He’s just blaming his cheating on her erratic behaviour. Her action were extreme and manipulate but she needed a psychologist not to be cheated on. If he had tried to help her then it would have been fine but he didn’t and that’s what gets me. He tried once then couldn’t be bothered trying again when it didn’t work. He didn’t make any effort.