Anyone have experience being the subject of the persecution delusions??

Does anyone have any experience with persecution delusions? My partner was diagnosed approx 8 months ago and the thing i am finding hard to deal with is supporting him and myself while he thinks and feels I have done something to him to harm him or I am planning to do that etc. He has been on LAI for 3 months now and while things like pacing and some disordered thoughts have improved etc, he still believes something had been done to him, he will not believe he has schizophrenia, has no insight at all. He refuses to get CBT because he says his brain has been damaged (on purpose) and nothing can be done to fix his 'brain damage'. I realise this sounds strange and confusing, it's hard to try and put into words. It's devaststing knowing my partner of 13 yrs truly in his soul thinks I have worked with others to destroy his life, that I have spent over a decade watching him as I destroy him, it's very painful to think about it too much, but no matter how bad ii feel, it must be so much worse being in his position