Husband refuses to move closer to our family!

Hello. My husband was diagnosed with mild cognitive impairment in 2024, although I saw symptoms several years before that. He has become extremely withdrawn, forgetful, easily agitated, unable to complete familiar tasks. He just can’t seem to “connect the dots”. Can’t keep his appointments straight. He depends on me for so much. He doesn’t use a cell phone or computer, has difficulty navigating the tv streaming. He food shops and comes home with so much that we don’t need or already have.
We moved to Florida from Vermont in 2014. Immediately after moving here, our grown children began to have children. I quickly began to regret the move. He has refused to move back. He says he loves it here in Florida and will never live there again.When I try to talk to him about it, he yells (screams) and tells me to move and he’ll file for divorce ( we’ve been together over 50 years). We do go there every summer for 3 months and rent a place, which has gotten very expensive. I’m so frustrated. He really shouldn’t be on his own, but I feel so trapped and angry. He’s 80 and I’m 74. We belong near our family.