texting I feel so sad for you.
In my relationship, dh did not want to talk about life insurance or wills, or the fact that our 'shared' money was in an account which solely belonged to him. However I am fortunate that in my situation the problem was caused only by his laziness, his distrust of insurance companies, his hatred of legal fees, his trust in the inherent good nature of others, and the belief that we would both live forever 
When I sat him down and explained exactly what might happen if he, or I, were incapacitated or dead, and when I told him how scared and worried it made me, he agreed that we should do all the right things. In our case that was taking out life insurance for me, short-term to cover our mortgage, because I am self employed (dh has a generous 'death in service' work cover so no need to do that for him); we have wills (probably a lawyer's nightmare, but still properly done and witnessed); we have reassigned where our money sits so both of us can access it now and could access it if the other were incapacitated or dead. And life continues and nothing much has changed.
But because of dh's reluctance to do any of it, it was a long and tough process of nagging and explaining and facing uncomfortable feelings and thoughts.
But it was made possible because we are in a loving, equal and trusting relationship.
That is not where you are, and so I suggest that you get some financial advocacy, someone who can spell out to your dh how HE would struggle if you were incapacitated or dead, and spell out how your CHILDREN would be left unsupported if he were incapacitated or dead.
Insurance can be a scam, but people pay insurance for freezers, computers, boiler repairs, all sorts of nonsense..... (and all this for something you can replace for a few hundred quid - or even do without) In comparison life insurance is damn cheap...