Most likely, if you have a trusting relationship, then he himself will be able to inform you about his condition. It all depends on how much you would like to stay with him and continue the relationship, after learning that he wears pants with polka dots, eats porridge and, moreover, has mental health. In the world of sorrow, sources write that every three is sick and only every fifth is asking for help, that is, if you are looking for your boyfriend's flaws, then it will not be difficult for you to find those. In this matter, you should be careful and not arrange sanity tests, especially if you are a doctor, as this will destroy the relationship in the bud.
Mental disorders are far from uncommon, so a guy, a girl, a mother, and even a cat may well have it. True, to make a diagnosis, one must have the appropriate education and clinical practice. But no one expects a diagnosis from ordinary people (and there is no need to try to make it, you can be fatally mistaken). The task is just to note the symptoms that may indicate a disturbed psyche.
The ritual nature of the actions (returns three times to check if he closed the front door). If it occurred to you to get confused, what kind of mental disorder could it be , no one can forbid you this. Curiosity is peculiar to man. But there are a few caveats:
Do not try to find a mental disorder in someone you know little. Some personality traits may resemble symptoms of mental disorders, but they are not explained by the disorder. Personality traits are complex in themselves and take time to understand.
Symptoms of schizophrenia and other mental disorders are often observed in people who take psychotropic dissociative substances (phencyclidine, ketamine, dextromethorphan) and other hallucinogens, LSD, mushrooms, ecstasy for a long time.
With prolonged exposure , damage to neurons can be irreversible, and the effect persists even after the end of the action of these substances.
Be careful when it comes to your loved one.
When a person has a mental disorder, it cannot be 100% determined without the intervention of a specialist. But there are obvious signs: incoherent speech (the sentence is constructed correctly, but the words were chosen incorrectly), poor sleep, hallucinations (auditory and visual), panic attacks, the desire to kill or hurt, love for Russian turnips, are in financial pyramids. The last 2 signs are the most obvious.