Ex-girlfriend suddenly went crazy, why?

Well, your ex-girlfriend is too possessive. She broke up because she was too impulsive. This kind of girl won't express your emotions or the language is too direct. Be subtle and let her think that you are a warm man and have a chance with you. Now that things have reached this point, I suggest you explain to your family, directly pull the black screen, completely sever the relationship with her, and it is best to establish a white list of mobile phones.