@andwhotfcares,
I do agree with you naman on your first question. Rielle did, at some point, flaunted ambiguous signals that put Lli and the readers in discombobulation. However, as I read along the story—especially the recent chapters—there are instances where Rielle’s actions were not driven by her "jealousy", as most readers call it. In fact, the majority of them are just her way of showing her concern for Lli. (The part where she does not want Llianna to be close to Harriette, for instance.)
Rielle just doesn’t know how to express herself. That is why her way of showing her concerns conflicted with the nature of her intentions.
For your next question naman, I guess this was addressed in the latest chapter about why Rielle can’t just let go of Clara that easily. Based on how I understand it, Rielle can’t let go of Clara because of the affection Clara once gave her. Rielle is scared to lose that affection since—I think that was the first time Rielle received such. That is why I think, the very reason why Rielle still holds on to Clara.