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Good evening. I certainly understand the situation and your concern. In Florida, he would have a legal right to those assets which have been acquired during the course of the marriage. While I understand he has not contributed and you have been the sole earner, it would not take away or eliminate his right/interest in the home or any other assets you have obtained, over the past 28 years. Even though the mortgage is in your name and you pay it, he still can claim a legal interest in the home, if it was purchased during the course of the marriage. If you do not want to give up or away this interest, then you need to remain married, unless you can settle on the distribution of the martial assets and the divorce would not be contested.
If he is unable to make decisions regarding his finances, then you may want to consider obtaining Power of Attorney of his financials and if needed, proceeding through the court to have it ordered, if he is not competent and of sound mind, so you can act on his behalf. If this happens, then you could possible be able to sell some of his assets, for support and to meet your expenses as you get older.
I just wanted to follow up and see if you had any other questions or needed me to clarify something. I am here to help, so please let me know. Thanks!