If you read the chapter about the bro asking the king for Spencer becoming agnes escort, you can see his reaction when he found agnes explanation correct, I think he is afraid of her taking his throne so he wants to get her married quickly...
It’s said that Raymond is his friend and judging by the info given, he’s closed to Raymond than his sister. The brother is the kind of type that cares more for what he wants but only cares for his sisters physical well-being/safety. His thought process is that others shouldn’t be insulting her, and only he can as her brother.
Why is the fl's brother acting like Raymond's little bitch helping him and all that?? What the fuck happened to his anger when Raymond was dissing his sister in front of him and now suddenly wants her? Does he even care that whether or not he truly likes her or just wants her to fuck her self respect again and just love him like crazy while he ignores her? It's INFURIATING. And What the fuck Raymond?? Just get the hell outta everyone's hair and Why is he even jealous of our kitty kyle? Nobody likes you blondie, just leave （/TДT)/ ╥﹏╥