For once, giving the potential cheater the benefit of the doubt paid off. Now, technically she slept with her new girlfriend and THEN broke it off with him, which, a little backwards. But you can tell she was seriously thinking about what to do since she went and called him as soon as she got home. And she's a teenager. I'll give her a pass. Comparisons to the previous series aside, this chapter makes me feel much better about where it's going.
Personally i don't feel better, precisely because they fucked before Youko break up. Not to mention making the boy like nothing more than just a plot device. He has done nothing, he was always ok for Youko to go with the other, we barely see him in 11 chapters, we never see them doing something together and worse of all, not only the break up was off screen (!!!!! Imagine treating something potentially big off screen) and you tell me he has accepted that her GF told her that she ditch him for a girl and he hold not grudge ? That's like plot convenienceat this maximum.
It's like a worse version of the BF arc in Girl Friends. At least, it's ending, not gonna lie that it's maybe for the better.