Stefan Salvatore fell in love with a girl right before he fell in love with Katherine and the girl's name was Cheyenne Hall. She had curly blonde hair and she wore glasses. Her eyes were blue. Presumably ever since Stefan learned how to write, he had been writing in diaries a majority of his life after that. Often writing down memories, facts and reminders in order not to forget them. In one particular page he kept a photograph of his ex-girlfriend, Katherine Pierce. When she actually read one of the diaries with her photograph in it, she asked him "You came back to fall in love with me all over again, didn't you?". She also mentioned that one diary included all of his inner thoughts and feelings.