With his jealous and controlling tendencies, as well as his lack of drinking (crutch), if you make moves to go back to school and get on a career path, I predict you will see the proverbial sh*t hit the fan!!! He might even cross the line from 'controlling' to 'abusive', so please educate yourself about emotional and financial abuse and what that looks like. Women that are financially dependent on their abusers are VERY vulnerable to more of the same while their sense of self-worth and sanity are slowly being chipped away.
Have you ever discussed this possibility with him? What was his response? If not, I challenge you to stick your toe in the water and just see....