Poor Fee :( I think they're kind of two sides of the same coin? Both introverts, each trying to make do in a world that doesn't really fit them? He goes hard in the other direction, pretends to be the person he thinks he's supposed to be, she muddles along as best she can, doing the parenthood thing and the work thing and probably gritting her teeth through every day?
Maybe they met in college and became friends? I think he'd admire her big brain a whole lot.