Tbh I am thinking there's a chance this isn't real 'I suppose it was the trend for marriage being a piece of paper'. Really? You are aware it was just a trend but planned your life on it anyway?
You live in a deprived area, he doesn't earn that much but managed to get a mortgage with both of your names on? So it must be a cheap area? When one person isn't working, mortgage application usually classea that person as a dependent. So he would have had an extra dependent to factor in.
So either he earns fairly well or it's a cheap area. I live in a similar area. Plenty of the mothers work when their kids go to school.
You are chose to be a sahm and choosing to remain so. You are choosing to be out of the work place. If he is on a low wage you, wont earn much you will get help towards breakfast clubs.
You sounds fairly young (around 30) so have time to build your pension. Being a sahm benefitted him. But it also benefitted you. Its choice you made and our choices have consequences. Whatever we choose.
You need to get back into work. Quite frankly if he isn't paid well, his pension won't be enough, if he died to keep you comfortable, pay the mortgage off etc
He needs life insurance, to pay the mortgage off, if he died. The more urgent situation would be if he left you. You wouldn't get to stay in the home for as long as you want or pay for yiu in anyway. You need your own income.
Which is why, in general, lots of women work.
Stop planning your life on what other people do or say and secure your own financial security.