Is it too late to implement this split in Ch19? They could have a moment to talk about if they really want to pursue a romantic relationship over a familial one now that they completed the goal of finding the hotel, it could be a reasonable time for them to rethink what they want to do. I don't fully remember the dialogues they had by the end of it, but it's still possible for people to realize that they can have romantic feelings for one another and decide that's best for them to not be in a relationship.