Shameful secrets cause a person to become haunted. She cannot sleep, for a shaming secret is like a cruel barbed wire that catches her across the gut as she tries to run free.
(Clarissa Pinkola Estés, Women Who Run With the Wolves)
the fact that no one* knew about akio's abuse of anthy is far from the only thing wrong with it, but the inherent shameful secrecy of it was an integral part of her abuse, something that significantly served to isolate anthy from her peers.
it was definitely akio's plan for utena to see anthy and akio at the end of ep. 36. (anthy's hands disappear into her hair = she had no hand in this. + the way the scene lights up like how lights come on at the beginning of a new scene in a play (anthy's previously black silhouette gaining color and features) = it was staged. not to mention her bleak expression) akio thought that utena would just be disgusted by her, and/or feel betrayed, and that would be that. however, he sealed his fate (anthy being able to ditch him) with this action, because utena offered anthy compassion and understanding instead of condemning her.
utena acknowledging anthy's pain as a result of being abused by akio touched anthy more than any of utena's other actions up to that point. while utena says a lot of stuff in that scene about utena's ego and being a prince, anthy only has visible reactions to two of utena's lines until utena is completely done speaking.
"And the night I learned about you and Akio...!"
the camera focuses completely on anthy, nothing else shown, as anthy slightly tilts her head up. there is no dialogue while anthy makes this small movement; anthy is listening intently for what utena will say next, and the show wants us to notice that.
"I thought that you had betrayed me. Even though you were suffering so much...!"
when utena talks about suffering- acknowledging that akio's treatment of anthy caused anthy pain- anthy uncurls her body significantly. a visual indicator of feeling less shame, immediately in that moment.
anthy does not move in reaction to anything else utena says until utena is fully done speaking, when anthy and utena are now shown kinda-holding eachother. utena may or may not know the full impact of her words, but it is clear to the viewers what moved anthy to say:
"It doesn't matter now. Just leave this school. Forget about everything that happened here!"
in anthy's opinion, this has to be the kindest, most honest thing she can say in this moment. utena leaving would ruin akio's plan and anthy would be the obvious reason why (likely leading to punishment), not to mention how anthy would obviously miss utena. the fact anthy said it anyway shows how impactful utena's statement was
it's good to talk about utena's obsessive girlprincing and how it was damaging. it's good that utena acknowledges it herself. but i think the fandom commonly overestimates how much that mattered to anthy, especially in relation to this scene. i feel that people sometimes abbreviate it as 'utena apologized to anthy for her egotistical behavior, and that brought them closer together!' like yes, she did and that was positive and indicative of utena maturing. but i do not think that was the most important aspect here
