((((((((( MIRACLE ))))))))))

I think it's time for you to try a different method. Rather than threatening to leave, how about sitting down with him with a cup of tea and say that you will help him find a job. Threatening him is just going to make him feel worse. It may be that he has difficulty filling out forms or writing a CV of information about himself. Sit down together and trawl through the papers and jobsites on the web and help him fill out those forms. Encourage him as much as you can, go with him to any interviews, support usually works better than getting angry about it.