Ok so basically there is a threshold of affection for every LI that determines whether your relationship is steady or unsteady. You just need to get more affection points with A and you can farm a lot in the first 5-6 chapters. I think I can tell you exactly what choices raise A's affection if you want, just let me know.
Ahh okay 😭 I thought I was doing pretty good at picking the best interactions with them but I started off both A and R with an unsteady relationship right after the masked person incident (A left my crown to escort a grieving widow which caused tension, and my crown stopped trusting R to speak to the nobles). I was just going crazy wondering if it was me or the game so thank you for letting me know and hopefully next time, I'll get the right answers 🫠