I wish I had a helpful answer for you. I shared my life with a man who had bipolar disorder. It was very challenging to live with, but as long as he had a structured life (work, for example) he could maintain. Unfortunately, the business he was working for closed and that was that. He began using hard drugs (heroin, meth). He became horrifying. Hostile, threatening, constantly moving, screaming, awful. I had no idea why he was behaving in such a way, except that I knew he needed medication (didn't know about the drug use until much later). He was not violent directly toward me, but he did absolutely crazy things to the home we were renting. I called the police repeatedly. They were useless. I felt terrified.
It didn't take long. One night I called my daughter for help. I packed up my cats, my pet rat, and stuffed my little Honda and her car with everything I could fit. I left the rest. I moved to a different town and never went back. I was very, very fortunate at the time to have enough money to be able to make that move. I lost almost everything I owned, however. A nightmare.
Anyway, my point is...meth is the drug of the devil. Add it to mental illness and there's no winning unless somehow treatment becomes involved.
I really would like to offer words of wisdom or ideas. What can police do unless the guy actively commits a crime? You would think the landlord would evict the guy, but probably not, as long as he pays the rent.
I feel so, so bad for you. You already live with enough of a challenge with your own mental illness. If I give it hard thought, the best I can come up with is writing a letter to the landlord, a very serious letter - or, perhaps even better, asking for an appointment with the landlord, then sitting down and being extremely clear in describing exactly what's happening and how serious that matter is.
I wish you the best.
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