Did the author swap the ex and her new girlfriend or something? In the pre-serialization, her ex had black hair and her new girlfriend had lighter hair, but, in this one, her ex has lighter hair and her new girlfriend has black hair. I guess it’s never specifically stated which one is her ex in the pre-serialization, but it seems it was supposed to be the black-haired girl. I mean, they don’t really look exactly the same though, so maybe the author just decided to completely switch things up.