I wonder; did you actually ever get proof Damien was his boss? Maybe the job did have something to do with him or people like him but idk… Do you think it’s Damien’s doing your brother doesn’t remember him anymore? I don’t see how it could make sense but still… maybe he does remember but it’s just like a cover. If he does not remember then how could he have something to do with your brother not remembering him, thus erasing his memories of what your brother knew about him so that you won’t find out? The way your brother acts just seems very suspicious to me (not in a bad way!!) he’s always uneasy around Damien as if he knew something you didn’t. And he showed up at your house probably because he knew about your vacation and how Damien would cope. I really think your brother knew and wanted to protect you, but maybe his job prevented him from talking about it?