Job dissatisfaction... again.

My husband (with ADHD) has been experiencing growing dissatisfaction with his work/career...again. He seems to go 2 years and yearns to change jobs. He is currently in an educational program to support his career it has been an investment of time and money, going on 3 years. I want to be supportive, but these decisions affect me, our children (his step children) and our financial and emotional future together. We've been together 6 years and married for 3. I want him to be happy and satisfied, but I need stability. Advice?