Boyfriends quit when they are unhappy and always change jobs. How can we change him?

Resignation because you are unhappy shows that work is not important to your boyfriend. At least he won't worry about whether his life is guaranteed because he has no job. So in this case, it is very difficult to change him. Unless you can cut off all his financial resources and make him realize the importance of work. So he won't be so casual.

Obviously, your boyfriend has a good family background behind him, so don't worry about three meals a day. When he reaches a certain age or gets married and makes him realize that he is the pillar of his family and can't do anything without a job, then he will cherish his current job and strive for a raise for himself. Even if he is unhappy, he will continue to insist.