this comment section is very strange to me. people hate her and call her a slut for accepting a confession? you do realize she doesn't know she's in a manga, and that her friend is in love with her. that's the whole point of the story. yes its sad because we want to see our main characters together, but she's not a bad person for not knowing everything the audience knows.
the male lead needs to stop moping and be proactive. as sad as it was in high school to see her not understand his confession, the truth is that he didn't make himself clear. he accepted defeat immediately and didnt try to change their relationship dynamic at all. he's 100% at fault. she cannot read his mind like we the audience can.