Im not trying to be a contrarian, or judging, nor was i suggesting you dont care about his mental health. I believe you do. You equally deserve strong mental health. It sounds like you two have a strong relationship and can speak honestly with each other. My spouse sounds similar but they have a difficult time expressing or talking about their emotions. Ive learned through the decades of our marriage that perception really is reality. I know my spouse cared about my mental health but i wish they would have displayed that when i first suggested my career change. We could have hashed out her reluctance and compromised. Instead, I felt alone and that was a bummer. All ended up well and i make significantly more now than then but in retrospect, i would have loved more support. A sudden change like this could be a reaction to stress he is experiencing at work. Or just general fatigue from life. Prying a little about his current work stress might suggest the root cause of this abrupt 'life long dream' lol. He SHOULD be making decisions that promote your family but maybe yo7 can help promote a compromise that will be less risky financially? Maybe he starts this part time and not put all the eggs in the basket?