TLDR: RO's don't have an "approval" rating, Having a high or low score doesn't determine good or bad, only what type of relationship you have.
There isn't really an "approval" rating as such, instead the relationships and feelings towards the RO are based around what side the stats lean towards.
Having a higher or lower number isn't positive or negative it's just the way in which your relationship is decided, so with Nour, having a lower number I.E being kind, truthful etc results in him being 'protective'
Parts of the story and relationship can be changed significantly based on what number you're closer to so make sure to aim for the number you want rather than trying to get them as high as possible :)