Did it really though? Sei has always been a great help, so the fact that you need her despite snubbing her hasn't changed all that much. The prince is still a jackass focused on the other girl, who is still quite valuable in terms of potential. Heck, I'm pretty sure it's clear at this point that Sei doesn't want to be known as the Saintess either anyway. It's basically an open secret.
So really, what's changed?
@Renae Wait, there's a second prince?