He screams, sees things, takes off, accuses me of things. He will yell and scream at you for something you didn't do. He has seen the videos on my camera in my driveway and says there is someone in the car with me when I pull in, there is not. Then he will accuse me of having sex in my car with someone even if I am home where I live alone.
We honestly need more. It seems you have no question here, really. And certainly we can be of no help with answers for you without solid information of age, medical and mental history, and whether or not you are his POA.
You do tell us in your profile that your partner is 72. But there is little else to guide us.
Offhand, just from description you are talking of mental illness or dementia of a sort of FTD or Lewy's type. But that is pure guesswork.
Please tell us what you have done to get your partner diagnosed. If you have done nothing, then Geaton is CORRECT absolutely. Call 911 and have him transported to the ER. Call in Social Workers at once and tell them what you have told us and that he is not currently diagnosed but that he presents a "danger to self and others". If this doesn't work, time to call APS.
Who is 28 yrs old? Look at your bio and see if it is correct.
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If he had his prostate removed 6 months ago and is now hallucinating, perhaps he has an infection. Did all this begin after the surgery? He needs to see his doctor for tests to see what is going on. Urinary tract infections can be toxic.
Does this person have mental illness and/or dementia? If so, don't bother telling them that they're wrong. You know they are so leave it at that.
If they are violent, cut contact so you are safe.