Do you qualify for housing benefit OP? No, you have said that you earn too much so you are not as badly off as many so that is something at least.
I'm not saying there aren't issues with low pay, the cost of living and the affordability of housing but it doesn't seem to be to much of a problem where the OP lives. Imagine if all areas had houses this cheap!! It is what many people are hoping for.
You work and have a partner earning a good/ high wage off-shore and you live in a part of the country where property is cheap. In a large area of the south & south east of England (not including London) and various other places on the UK, you could not rent a single room in a grotty shared house for what you pay in rent for an entire house and a large garden, and yet the minimum wage is the same nationally. Housing Benefit rarely covers the whole rent so someone could be topping up £100 a month or more, plus bills, still on the minimum wage or receiving benefits.
Am I wrong that your DP earns a good wage? More than £18000 I suspect? Plus your wage? You aren't wealthy perhaps, but you aren't doing too badly. If I have got these numbers completely wrong then I apologise.
So in comparison to many, then yes, you are in a position to private rent - on your income at least, and you are at least able to pay the full market rent on a council house, rather than a reduced rate. There might be other factors making it difficult to private rent, but on income alone it doesn't seem so. Some rents are so high, that you have to be earning over £50000 just to rent a small house. You aren't in that situation.
You are also able to rent privately because you and/or your DP are working when most non-working tenants are refused. That's pretty tough luck if you are too unwell/ disabled to work, and is the crux of why we need council housing for the people who are the most in need/ worst off.
I think on your last thread you were already in housing association housing but have managed to get a bigger council house elsewhere at even less money. That is pretty good fortune!
So this is good news for you OP! If I have got your situation right, you are doing OK in many respects. Despite your anxieties. If you were a couple/ family who could not work through ill-health, then think how much worse it would be and how desperate you would be for a council house. I'm pretty sure then you would feel at least a bit miffed if you found that you couldn't get one because a much better off family had it instead.
In an ideal world then maybe more families could have council tenancies, but you have to realise there is a huge shortage and that people who are suffering more than you can't get housed. It is only human to wish that you sounded more grateful for the rules that means you are entitled. In many areas I have lived in, you would not be given priority regardless of how long you have been on the list and I think that this is right and fair.
You need to ask your DP to contribute fairly to the house he lives in, and to the family. You shouldn't be bearing all the expenses on your own. There are lots of threads on MN about sharing finances which might be helpful.