Cookiebaker, how long have you had your two birds together?
If you had your Azure bird first and Rilla has never been an only bird I am sure he is missing his feathered friend.
Does Rilla perk up for you when you interact with him now or not at all?
I would say if not for you, but for your bird go ahead and get a new bird. I think that a new feathered friend may perk up your lonely bird.
I have a feeling that Popcornbird will also tell you to get a new birdie.