I see that the hate boner for Haruki know no boundaries, even when she come in terms with her own feelings. I already said that her being naked was purely symbolic that she have nothing to hide to Aya about her feelings. You realise she could have easily done something but decide not to because she know Aya will be hurt by that. It take a lot of courage from Haruki to do that and peoples still found a way to be mad at her. She even say no to Mochida when Mochida talk about her plan because she know that if Sei get hurt, it would hurt Aya too so she don't want to play along.
She didn't sell Aya because then she would have suffered collateral damage, but if there was a way to hurt Sei alone she would surely have done it, this is selfishness not to be mistaken with kindness.
Also suddenly getting naked on your friend because you want to show them that you have nothing to hide is still pretty weird.
I don't hate Haruki because I understand how she feels but I can't say I like her either, she gives off this obsessed stalker vibe which is unpleasant.