Did send D. a shortened version of the first letter. Did call his theory a delusion and did recommend neuroleptics - the European term for AP's. Said that if I ever hear anything like this on Skype, I will ban him; on email, I will filter out his address; and at home, I will immediately go live with bff or my former teacher (he knows both well). Told him to think hard about whether he can manage what I am asking for, because if he cannot, I'd rather go live with bff from the outset. Told him at the end that I am happy with him in all other regards - this is my only complain.

Will see the new guy, G., tomorrow.