New and worried for friend

Hello,

I have had a friend for the last four months. We met when I was at a bar listening to a band. We became friends and eventually he told me he had been diagnosed with schizophrenia and PTSD. He told me nobody ever sticks with him and eventually abandons him. Progressively through getting to know him he became agitated at times with me wanting to steal his dog or things like that. I have been helping as he cannot work and occasional has inflammation in his knee with small bills and groceries.

This past weekend he accused me and another friend from the bar of being undercover police and wrote me an alarming text and said he had confirmed "my partner and I were cops.". He had told me if he found out I was a cop he would kill me.

Now I understand these are delusions. I wrote to him and said as much. I feel so helpless to be able to help him any more as my safety seems to be at stake. I accepted him as my friend and feel he needs more support. He is under a physician's care and claims to be taking his medicine. I cannot confirm he does but he says he desperately wants to feel better in the moments he is not in a psychotic episode.

Is there anything I can do?

Thank you.