Zack is the heir to a kingdom. No big deal. He’s also getting married to one of the children of the planet’s largest kingdoms. Doubly no big deal. His betrothed is apparently kind of not into him at all, even as potential friends? That’s kind of a big deal. 

He just doesn’t get it. He’s nice, he’s cool, he’s strong! He’s always out on his subject’s land, helping them tend to their crops or manage their livestock. That’s definitely betrothed material!