I hope that Lombard was just manipulated into breaking off the engagement publicly (and stupidly) by the other prince's faction. I don't want him and MC together romantically, but it seems like they used to have a good friendship when they were kids. I hope they're able to make up.
That said, Sherina looks like a cutie, I'm glad she and MC are friends.
So the prince is fully confirmed to just be a dumb idiot, and is now also having a breakdown because doesn't understand why people wouldn't approve of his behavior. And the king doesn't understand why the prince did that, and apparently hasn't considered having a conversation with him to find out? Well, maybe he tried, and the prince's explanations were so incoherent he couldn't follow them.