What do you mean by 'might'? Are you not joint owners? Check with a solicitor whether you are 'tenants in common'. If you are, then the house is automatically yours if he should decease before you.
Don't you have ANY income at all? Are you safeguarding your national insurance contributions while you are bringing up children? You must find out from the Government web sites how to claim points for state pension for raising children. (I apologise if I have missed your post about this, if you posted already.) You can be credited with points. If you don't work, you won't have a sizeable pension, and will have to claim benefits, which is unfair if you have given him the best years of your life and he has worked you like a slave.
I would say that most life assurance policies would cover the outstanding mortgage capital at least, but if you are not the beneficiary, it will not help you in the future.
Do you know who the beneficiary is on his life assurance policy? It might not be you. Don't rely on it for your future.
Don't ask him to 'go through' anything together.
I think you should divorce him, for your safety if for nothing else. People who run houses for 'battered women' have so many answers to questions, and you don't have to turn up at their door to get those answers, and they won't charge solicitor's fees either. They may not give you legal advice, because that is not allowed, but they can certainly give some answers based on their experiences.
If you divorce, you can set up your own house. You may have to go on benefits to do that, but don't shy away from that. Millions of people are claiming benefits and you should do so, but you have to be on your own, as your husband's income will be taken into account.
Talking of which, if you can find a bolt hole somewhere, and start separation proceedings. Then claim for benefits. The DWP will access your husband's records and see what his earnings are. It won't effect you if you are separated, but if he has some shady dealings going on, they will investigate for free. They won't tell you anything, but they will surely keep an eye on him. What have you got to lose if you start that ball rolling?
You have a lot to lose if you stay with him.