'I dropped my math class immediately after learning that [she] had a boyfriend,' he wrote. 'I couldn't look at her beauty anymore, knowing that some punk was able to enjoy having sex with her every day.'

Soon after, he dropped all of his classes.

'I didn't want to torture myself with going to college and looking at all of those beautiful girls I could never have,' he explained. 'The only thing I could do was even the score. I wanted to make everyone else suffer just as they made me suffer. I wanted revenge.'

Rodger, who moved to the U.S. from the U.K. when he was five, also named a British girl he made friends with when he relocated to the Los Angeles area.

But he said they grew apart after she became more popular, writing: 'My first friend in America had grown up to represent the type of people who have caused me so much pain in my life. She would eventually come to represent everything I hate.'

The girl's stepfather told MailOnline that he didn't want to comment on how she was coping, but added: 'It’s tragic, our heart goes to everyone, to the victims and all their families.'

He also detailed his loathing for the stepdaughter of a family friend who was a year younger than him.

'My fear of girls made me keep my distance from [her]. She was a total b**** anyway, and her attitude would only get worse. She is a true representative of everything I hate about women.'

The women are to talk to the FBI to determine how he turned into a killer, the Mirror reported.

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