I needed to play a second time to understand the mystery boy ending: Albert didnt lied, he just plotted the discovery.He knew they would try to bully her and since the city is his, probably knew where,so he filmed.In the proper time, he induced her to the room, and she saw and remembered it all. He used the course and the happenings in his favor to get her for good, since he also could end her curse, but the curse and the killings, also her memory, all true.She didnt realized she discovered not by mistake, but because he made her find it all on purpose, that was what the mystery boy was talking when he mention it.