“I could never date a woman who earns more than I do”
So essentially, this man’s sense of self-worth, his sense of having an equal hand in a relationship, his sense of being a man completely goes out the window when your salary exceeds his. It wouldn’t just bother him a little to not be able to treat you to nicer things. He is saying he could not stand to have a woman make more money than he does. Forget if she is happy in her career: if it makes him unhappy, he’s out of there. Pretty selfish when you think about it that way.