Depressing, isn’t it?
And how many of the people wanting a 50/50 split of all the expenses have always contributed half of everything in their own homes? I have said that IMO the OP should get some of the rent coming in from her partner’s house, but after 30 years together there will be payoffs and shared arrangements that are about far more than money. Relationships are not financial transactions.
We don’t know the detail of any of it, and comments about the OP being abused and her partner being a selfish user are based on very little other than a rush to judgment.
We know that nanafish is unhappy with the relationship and is asking for advice, but that she values the companionship of having him around. The suggestions that she throw him out and live alone after 30 years with him, as opposed to finding a way to make things work seem to me to be based on a wish to see her suffer loneliness and pain because people disapprove of how the relationship started, even though she has said that things were complicated.
Maybe it is over. Maybe she would be better off without him. But that’s not what she is saying- she is asking for advice, and if things were as clear cut as some say, she wouldn’t need it.
Few relationships are perfect, and this one has lasted for decades, so it’s not the same as refusing a third date. Why the rush to persuade her to start again in what is, presumably, later life if there are ways to salvage what they have?
I strongly suspect that had she omitted the detail about how they got together (and we don’t have the full story at all) the advice would be different, and based more on what is likely to make her happy in future, not punishing her for the little we know about her past.