i agree that Eri can't blame herself for not being considerate of feelings she wasn't even aware about that much is 100% Fuyu's fault, HOWEVER Eri's blame lies at the fact that she uses everyone in her life as crutches, she used her boyfriends and previous flings as sexual and romantic crutches because she had fuyu as her one true emotial crutch, she used her and treated her as a lover in every aspect except when it came to her comitment to that relationship, whishing that they were eachothers number one but as long as she could fuck around since in her pov sex and kisses don't matter as much as a childhood relationship, Fuyu shoud've brought this up way earlier since the full weight of this toxic ass relationship is laying on her, but even if Eri wasn't aware of her romantic feelings, this dynamic was still so uneven