I just got a new job (in the same field as him) and I am making about equal or slightly more than my SO. He keeps his ego pretty in check and he's just proud of me. We both work hard for our money and he understands that
I earn somewhat more than my husband, and since he is IC (tennis coach/teaching pro), my income is steadier.
It used to bother him some. But he got over it, especially once I made him responsible for some of the household expenses. At one time they were just about all coming out of my paycheck/bank account, and now it's about even-steven.