I replied to this post in a haha funny way but actually I wanna take this opportunity to explore feminism in Under the Oak Tree (spoilers for Riftan's side story and early Season 2 of the novel)
Wedon is a misogynistic country. The only way to gain power as a woman is to either a. Be the Actual Princess, b. Become a mage (requires mana affinity), or c. Marry into it. Maxi and Rosetta are both completely at the mercy of their extremely sexist and abusive father; we see it much more with Maxi obviously, but we also know that Rosetta was forced to watch every time Maxi was beaten, and isn't particularly enthused about marrying the Prince (I forget how she feels about her son honestly but I think she loves him). Agnes is pretty unrestricted but that's because she's the Actual Princess and also a mage of Nornui, meaning she's under their protection (and their equality) even when she isn't at the tower. The only other non-maid women in the story are the mages Maxi meets, as well as the women who have to disguise themselves to help with the battle at Eth Lene.
This is all background to say that because the real world has so much experience with misogynistic societies, we can extrapolate about other ways it manifests in Wedon, and Riftan is an INCREDIBLE example.
Riftan's whole gig is that he NEEDS Maxi. He doesn't just want or love her, he NEEDS her. She's like air to him. He'd do anything to be with her. For Riftan, this manifests in protectiveness and spoiling her with material wealth, because he thinks that's his job as a man. He grew up watching his stepfather take care of his deeply unwell and suicidal mother until her death, knowing she was always waiting for Riftan's father, without batting an eye. Then he took care of Riftan even after she died, and it's implied that he really didn't have to. This was Riftan's example of a good man; protecting your woman no matter what. "Protecting" also means "providing for", of course, and since he thinks Maxi is this extremely rich noble woman (when in truth she never got to enjoy the splendor of her social class), she has to be provided with a lot more to be happy. So he writes her an eternal blank check and refuses to do anything that would put her in danger, because to him, that's what it means to be a good husband. He's so engrossed in it that he can't hear Maxi telling him that it isn't what she wants. He's that terrified of losing her. Additionally, he has to protect her from himself - his stepfather never burdened his mother with any of his baggage, after all. I certainly don't think she was well enough to care for Riftan's stepbrother. So because Riftan is following that example, he desperately conceals how much he needs Maxi and never relies on her for anything, otherwise he's be failing to protect her and he'd lose her.
This is a very romantic take on the same phenomenon we see happening to (usually cishet) men today; they perform stoicism and fantasize about being this end-all-be-all provider. Except in the real world, they don't do it because they're just that in love with their wives, they do it because they think society and especially other men will reject them.
In short, feminism could probably cut the whole story in half.