He’s not well. He’s not stable enough to succeed in a relationship. Based on the information you have provided, his psychotic episodes seem to have been triggered by drugs and unlikely anything else.
It’s good that you’re moving away. This relationship is not healthy for either one of you. In fact, your being involved with him might have inadvertently enabled his drug use. As you noted, things became worse when you provided him a safe place to live, away from his family. He was using drugs and there was nothing you could do to stop it. Until he is off drugs and mentally stable for a minimum of six months, you should not encourage a relationship.
The best thing you can do is encourage him to seek professional help. Suggest drug rehabilitation and therapy. If he continues to use drugs, he will, in all likelihood, have more psychotic episodes. Some research suggests that psychotic episodes damage the brain. Proof, they say, is that it takes longer to recover from each subsequent psychotic episode. He needs professional help, now more than ever. Anything you can say or do to make that happen will be of immense benefit to his mental health. Please take care.
Dr. Kristina Randle