I went through a resist Dark Urge playthrough and romanced Shadowheart. Up to act 3 it seemed fine, I got the special romance related Dark Urge cutscene at the end of act 2. After going into act 3 however the game seemed to forget I was in romance. All of her responses were just generic non-romance responses to Dark Urge related events, with some of them being far from appropriate for a 100 approval romance situation. Now I find out there's supposed to be romance specific dialogue for Dark Urge during the bigger events and I can't seem to trigger them.