[cturner]

Try the Pieter Hintjens psycopath book. Overlook that he uses a non-clinical use of the word psycopath. Pretend he instead wrote vampire, and read for the content. He gives strategies that do not involve leaving, and that seek to build you to a position of strength so your antagonist has to bend. (I have not had cause to test any of it, so no annecdotal endorsements herr)