American Royals

I'm all for the royal dramas & gossips (even when it's fiction).
Though most of the main characters are so entitled, spoiled, selfish and self-centered, (the only half decent one is princess Beatrice) I still couldn't stop reading. If this is a TV series, I would binge-watch it for sure.
But why did the author feel the need to pair up every single character in this book? Why does everyone like someone and that someone happens to like someone else or is forced to be in a relationship with someone they don't love? I guess the real royals are that messed up too.

Characters that I dislike:
Sam (2nd princess) what a jealous brat! She was so mean to her sister Beatrice over a guy she had only made out with twice.
Nina (Sam's best fren) though Daphne is a manipulative bitch, she is no better for almost sleeping w the prince while he is still dating Daph.
Jeff (prince) what a love-blind useless prince.
Hey I didn't dislike Daphne even though she is the antagonist. I somewhat admire her determination & dedication.