It's frustrating to watch an old relationship crumble without (apparently) anyone putting in the effort to communicate about what's going wrong.
Not that that's necessary before breaking up, to be clear! It's anyone's prerogative to walk away, and if he just felt it wasn't working, or that the only ways to broach the subject were more combative than he was willing to deal with, that's totally reasonable. I'm not criticizing him! Walking away from abusive relationships is good.
Other than that, this chapter's interesting in the extent to which if I swap the genders this becomes very familiar shoujo plot points (leave bad boyfreind, get makeover, be baffled by how much everyone appreciates you suddenly). Except all done distinctly shounen-style. Colour me intrigued for now. At least in an abstract, detached sense. XD For, alas, it seems to have brought all the... usual flaws of generic shounen stuff with it, too.