On page 009 of 7.2 where Miu says
Since it's you, Mei-chan, I can tell you. My friend is her ex-lover.
I feel like the translation is a little off.
The original says
鳴さんだから教えるんですよ?私の友達で 元恋人さん ですからね
And it looks to me more like she's teasing Mei by calling her her ex-lover (because of the pretend lover request thing of chapter 6) so something more like
"Since it's you, Mei-chan, I can tell you. Because you're my friend and ex-lover."
I would try participating in /u/ translation qc a bit before hand if I had any idea how to navigate that forum (and the time to figure it out I guess)... but alas I only really know how to see the results after they're released like this.