Didn't she and her mother have an agreement not to reveal her identity at school? I don't know; in my opinion, the mother is going to try to find out if this friend knows the truth.
The funny thing is that the author will probably portray this guy as a good person in the future, and I wouldn't be surprised if he ends up becoming a friend.
As a Brazilian, I obviously know how to read Portuguese. Reading the predictions really made me want to give away spoilers, but the translation team asked me not to.