I'll be honest. Asuna may not be the greatest of people and she has problems to work out.
Her character has been the first to admit that, but then again, each character in this story has a major personality deficit, so I wouldn't completely hold Asuna's personality flaw against her. I kinda like the fact that she has the capacity to be gritty. It's not a bad thing unless she is like that ALL the time.
But I take major issue with the way they "broke up" this chapter. Fueko and Asuna genuinely still liked each other and after a genuine apology cry session there isn't anything stopping them from trying to work things out. I disagree with Sacchan's remark about Fue being an adult. She didn't do anything but continue to run from her problems in the end, EVEN IF SHE WORKED THEM OUT with Asuna she still scrambled after they made up. Fighting through those problems is what relationships are supposed to do.
Fueko is still a child and IMO she realizes that. That is why she disagreed when she Sacchan said she was being adult about the whole issue. However, the fact that she did go talk to Asuna was an adult-like thing to do which means that she is growing up.
I understand the concept of not being able to "complete one another" but things don't add up. Fue loved Asuna but didn't completely know her more...problematic side which is part of Asuna. But you can't completely be in love with someone unless you know all parts of them. However in the end she wanted to make things work and came to work things out. Which means she came to terms with it and still loved Asuna. But then she ran away from her love in the end. But then does that mean she really loved her? But she came back to help out Asuna which means she did. But...
Do you see where I'm going with this? A loop-styled plot hole that has no place existing as the conclusion to their story.
Again, IMO it's not a complete loop-styled plot because 'but then she deleted Asuna's contact information.' At that point, Fueko was trying to break the cycle. Does that mean that some other event will happen and force Asuna and Fueko back together or at least make them interact with one another? Sure it could happen, but for now, they can each concentrate on themselves.