sorry, dont buy the "its so hard to find a job" line.
Supermarkets need shelf stackers, drivers, till assistants, home shoppers. security companies need security guards. there are jobs everywhere, if you look for them. Even if he sets himself up as a professional babysitter/dog walker/home helper/gardener.
Social care assistants are paid a pittance, but there is a massive shortage of them.
The voluntary sector is desperate for helpers, and this at least is something for his CV.
Ditto Schools - he could offer to help kids with reading, or playground support - just for a chance to get a foot in the door.
He could look into doing hard physical graft - I used to work as a carpet cleaner, it was really strenuous work, paid bugger all, but at least I was earning.
even if he opts for 3 or 4 part time jobs, he would be better off than doing nothing.
Dont buy the line that he cannot find work. He doesnt want to. You cannot live on love alone.
AT your age, your money should be going towards clothes and drinks with your mates and fun stuff -lord knows wen babies arrive, your money goes elsewhere! You should not settle for having a grown up dependant, no matter much you love him.