In what way at all is this about the reincarnation of the heavenly demon?

Why the he** does he want to leave so bad? To what? Be alone and also be wanted by the Demonic Cult? It must be SO hard being nobility in a powerful organization and having close friends.

I consider Teresa rejecting his invitation an absolute betrayal. Essentially every time she has entered the tower, it was while fighting with him, and she saw right in front of her that he has an antagonistic relationship with the Empire.