I think in both her marriages Alex was the Mother to her husband.
Maybe she likes to be in charge? That's sad for a woman who's so smart and capable. She's more competent as a royal than both her ex-husband and her ex-brother-in-law.
I agree on all counts, which is why I empathize with her in light of the photos of Martin's night out.
I've known a lot of strong and capable women who, either by choice or necessity, ending up holding the reigns in their relationship and who eventually were heartbroken by their partner's boyish behaviour, or completely burnt out by playing Mom.