there's 5 books total (book 5 being side stories only) and we're around half of book 3 i'd say
SPOILERS
this short arc about shuri and their father's past is completed by a discussion between jeremy and her. then Shuri and Nora (and Rachel) go to Safavid where they confess ~
book 3 ends with them coming back in a relationship and book 4 is all about their romance arc and finishing all other's characters stories!
i only remember verbal and emotional abuse. he was very manipulating, giving her affection and then locking her up and berating her. he did drag her by the wrist one time but nothing more happened on the physical level.
SPOILERS
but he was definitly capable of violence as when he learnt Ludivika (dead queen) was going to marry the king, he almost strangled her to death.

guys where is it now? did the Nora Suri romance arc begin?