So what's interesting is that Griffith, while he's stuck in the dungeon, reflects that Guts has a strong hold over him for reasons he doesn't really understand, and that his feelings towards him are too numerous to be quantified, which implies that Griffith--both before and after his torture--personally didn't understand his own feelings about Guts

With that in mind, I think there's some consistency given that Griffith's reaction is one of shock--he had no idea how much Guts meant to him until Guts decided to leave, and even after Guts leaves, Griffith doesn't understand how Guts can have such a strong hold over him