My girlfriend finished with me 2 months ago, she is bulimic and I think she is depressed. Since we split she has lost weigth and her moods have gotten worse. Her best friend confronted me about it as she had noticed my girlfriend eating loads and spending long times in the toilet. The thing is we don't know what to do PLEASE HELP

Speak to her parents or to someone at the school.

Bulimia can be serious if left untreated and it is made worse by depression.

Speak to an adult.

Bulimia is very serious. I was bulimic for years. I would talk to her about speaking to a counseler. Depending on your relationship with her she might confide in you. Talk to her parents. Do whatever it takes.