My friends in memories

a girl named Rafa seemed to have a problem with her friends it began with friendship and ends with her being alone. it's part of her life she help people before she knows it she is being left but after sometime her friend came back and told her she change her. and now she seems to have a problem with a boy his name spells like this 'A.E.M.C' his name will be a secret but will be reveiled in the story.

Who is this A.E.M.C.? What is A.E.M.C in Rafa's life? would their be another? or is he for one who will leave her.