Gave me chills... I feel bad for Yami... poor thing.
I feel like she doesn't see herself with Yuu even though she is in love with him, because her image of herself is filthy and terrible, and she feels trapped in her family-related circumstances, while the image she has of Yuu is much more innocent, youthful and overall positive. I guess it's a self sabotage thing, it seems she doesn't think things could possibly work out well between them due to their differences.
But I feel like most of this was already suggested in chapter 29... chapter 30 just made it more heartbreaking because we see how much it affects Yami even though she's the one making the decision to cut ties </3
I'm excited to see what's going to happen next...?