
The way Diana is now made me think that she actually didn't love Helios. Like, Maybe. Of the two, he had the higher rank and being the greedy self-centered biatch she is, just because she got minor healing powers, of course she chose a prince even when she was clearly unfitting for the role. Heck, I don't remember her doing anything for the populace that helped her reach the stars. She barely looks at them anymore and lets the temple garner absurd fees, unlike when she had powers and wasn't the wife of a prince where her healing was for all.
I bet that's why she lost her powers.
She became a saint because of what she did before but because she lost herself in grandeur, she lost her powers. She's not acting like a saint, moreso a wolf in sheep's clothing but instead of being intentional, she's more deranged.