Yes, I massively out earn my ex, even though we broke up when I was pregnant, put myself through uni a second time, bought my own (small home) worked hard to get promotions.
He dithered, wasted his degree, job hopped so he didn't have to pay me money, lived in dingy flats until he met his gf and moved into her house. He resents every penny he gives me especially as I am clearly doing better than he is in spite of being the parent doing all the care for DD (my parents supported massively with child care) as he only sees her a day a week.