Paranoid partner

Hi everyone,

I am reaching out because I have realized my partner is most probably dealing with paranoid. He has falsely accused me of cheating several times and when we are with others he thinks everyone are against him or are talking behind his back. Last night he accussed me of sleeping with one of our friends and that was the bottom line for me. We started dating 6months ago after being friends for almost a year. He never showed these signs in friendship but once we got serious I started to realize. Especially considering that his family have a history of schizophernia. He says they all get tested yearly but I believe these all could be related. A few weeks ago I directly sent him a link of paranoid definition and he agreed he might have this. He had a few therapy sessions and was calm but last night he flipped again. I do love him and he really loves me too. I dont know what is the best move! I have told him I need time to think if I can give more chances or not. I want to understand that this is not his fault and its a mental illness, but I also feel like its a kind that will always come back. Any advice?

Thanks :(