I have same opinion. Maybe the author wanted her to have character development. But damn like after 50 chapts? I would say she's kinda pushover egoistic woman, want to change someone but got zero analytical thinking. Idk dude, I just hope she'll step out from her own bubble soon. I like the stories tho...
Maybe its not shown well, but Rose thinks to herself that she remembers the end of the novel on one of the last pages, so I think its not a matter that she can't love Ain/Cassius but she doesn't want them to go down the villain route and get themselves killed like the original story. She wants Ain to 'grow up well' and be happy, and she knows that wasn't the ending in store for him. I think she still loves both of them for now.
Idk but I get rlly pissed with this conditional love
She loves her idea of Ein and Cassius and not them completly, just the good parts
She never stops to think why must they be villains, its not like ppl just wake up and r "well, I wanna drink some poison, so yuumy" ┑(￣Д ￣)┍
She wanna change them, but forgot the type of society they are in and it gets me so mad
She wants them to stop killing the ppl send to their home to assassin them, ok but... how do u stop the assassins? And the poison trainning? Cuz it was the poison training that saved her and Ein's life.... Dudes she is literally their weakness wth