He is suffering from a serious mental issue, quite likely more than one. Borderline personality disorder is definitely a possibility, as is paranoid personality disorder and antisocial personality disorder. What are the chances that he would get a psychiatric evaluation?

At an absolute minimum, please, I urge you not to go driving with him.

Paranoid personality disorder - Wikipedia, the free encyclopedia

https://www.clearviewwomenscenter.co...der-dsm-v.html

Antisocial Personality Disorder DSM-5 301.7 (F60.2) - Therapedia