Ya know ... it sucks that it looks like this is heading in the direction of the pre-serialization story (and that Mikkun is such a goddam idiot), but I think at least it doesn't feel like either of them are going to purposefully hurt the other. I read too much drama yuri where one of the girls decides to do something to seriously hurt the other, or is kind of a sociopath who doesn't really comprehend just how shitty they are as a person despite good (the jaw-dropping scene in My Joy comes to mind).
The fact is, these two never really seemed to mesh right from the beginning. As good as they seem for each other sometimes, there are a lot of important issues they don't see eye to eye on. It felt like they mostly dated because they just both conveniently happened to be lesbians. Really, a clean and amicable break is the best outcome for this series.