i'm a little confused (unlocked spoilers kinda)

Ok so in unlocked (i forget what page it is), Sophie goes to Keefe's house and sees that Lord Cassius and Fitz are there. She kinda goes off on Lord Cassius because he kinda ridicules Keefe (I think) and she's like ok listen up here buddy this is all because of how bad of a father you are. But THEN, after Sophie's done ranting, Lord Cassius says that whatever she's feeling is interesting. Fitz says like what he's talking about and Lord Cassius says something like "do you want me to tell him what you're talking about?" and Sophie's like no it doesn't matter. But anyways, I was wondering what Lord Cassius felt? Like did he figure out that Sophie loved Keefe? Or like what? Idk but basically it's been bothering me since the day I read the book so if anyone has any theories I would love to hear them.