Just walks away

No one will freaking listen to me! The man had brain damage! it is documented. He was put on full disability in 3 MONTHS by the government!! It is a progressive disease! He is not able to make sane and rational decisions! He decided one day he was not inlove with me anymore and wants a divorce! Who does that? After 25 years! and we did not have a bad marriage. No cheating. No lies. No cussing. no screaming NOTHING! Then he just leaves. That is NOT NORMAL! They all know he was diagnosed with dementia. But now that he is acting totally out of character. well they say he is not sick there is nothing wrong with him. I just need to leave him alone. The last 2 years has been hard on us because of his anxiety and his depression brought on by the disease... the headaches, the paranoia, the forgetfulness. We dealt with it as a family! The kids and I went into counseling to deal with it because we LOVE him. Then he just leaves us. Without a look back. We were talking, Not about getting back together but about staying in each others lives but not live together right now. He told me yesterday I could call him whenever, we could still go to lunch like we have for the last 20 years, he was calling me to come help him set up his phone and his tv or whatever else he needed. Now today. After lunch, because I was there at lunch to help him set up an account on his phone at HIS request, he told me we should only communicate about the kids, and he wouldn't be calling me for help anymore because he don't want to lead me on. I am devastated and I am pissed. and i am so so sad.