I felt the same way,, yet I got mass neg repped too. So heres a Pos rep :) I feel ya bro, thats what disappointed me too (but I accept its part of her character for the story) Shes the type who didnt bother to find out why your "a bad man" after those great times with you just had with her and pulled her mother out of poverty. Even after accepting to risk your relationship with your step sis just to sort it out. Lucky enough, I liked the other girls better ^_~. So I can push her, as water under a bridge ^_~. The step sis is going to be one wild one to tame ^_~ Safety helmets on!
But If you like the game and wanted to support it, I dont think its right to quit now, Have hope, that maybe in coming chapters she might grovel down and beg forgiveness. Who knows. Shes not outside of a redemption arc. She'd need alot to make up for tho