Welcome to the "in limbo" called the disease of ambiguity, and the challenge with any early diagnosis of memory loss, delayed thinking, they are in denial and don't believe it. I'm not sure what you can do, I only know what I did in my given situation. For me, I noticed things.... my husband denied anything was wrong. So I reached out to our primary care, sent a note on the portal about what I was noticing and booked an appointment under the pretext of a 6 month visit. When we got there, I didn't mention alzheimers or dementia, but did mention that since we were care partners for one another, I was concerned since we had both been in a house with mold, which I had read could cause confusion and memory loss. She gave him a basic test in the office and then suggested when he couldn't remember the words and/or sequencing things that she wanted him to see a neurologist. You may not have access to your roommates' doctor, but all you can do is tee up the problem, to either the doctor if you have access and/or your roommate in an ongoing loving, non-defensive way. Tap into Dr. Natali, Careblazers on UTUBE, and see if there are any videos on how to have the dialogue with a loved one, about what you are seeing, so you can make them more aware, and it resonates, and they reach out for help - so key for early on treatment. I am still reluctant to say anything to my husband's friends as once they hear "something could be wrong, they "talk" through the community and walk away." I saw it happen with my neighbor; sad but true. I did talk to one of my husband's sons, after my husband started lequembe infusions for early memory loss. Believe me, I practiced a lot in how I talked to my husband early on, which led him finally to the doctors, and then what I said to the doctor once we got there to try to make the conversation positive, loving, and handled in the most dignified way. I just notice the words I pick with my husband regarding his memory loss are key - even to this day with him on the infusions - so it doesn't put him on the defense, and it looks more like we're working on "aging" together. Hope this helps in some small way. Best, Karla