My partner has of late been saying that there is someone else driving my car and going to my work and doing all the things I am doing every day and he tells me all this when I come in from work. He is positive that I with this other person is trying to make out he is losing his mind. When asked about this other person he says they as very similar to me. Partner was diagnosed with vascular /temporal dementia middle of last year. What do I do when he starts to get very angry with me.