I think what I like here, is that Reina talks about how she felt like Ayaka was the one MC relied on, rather than her, when she was his girlfriend.
And then she relies on the """"advice"""" of two people unrelated to her relationship, for advice on how to deal with a problem with her boyfriend.
That right there shows her lack of self-awareness. Not even touching the fact she was so easily swayed by her Kouhai (who I think might only be less bad than Natsuki in that he hasn't come around in MC's life to harass him like Natsuki has), but Reina shows she isn't ready for a relationship just on the grounds of inability to communicate. I could understand listening to Natsuki, and even she said "you have to decide this for yourself", but ultimately Reina kinda screwed up big time here.
I hope MC, even if he forgives her, does not try to repair their relationship. I have this worrying thought that he'll not read as deeply into what I just expounded on above as he should, and think "oh maybe it would work if we just try communicating more than before" and will try to get her back.
And since this updates 4 times a year we'll be stuck waiting until Halloween to even hear what comes next, and I feel like it'll be Flashback Part II given where this one cut off.
Absolutely mindnumbingly awe-inspiring how silly this is.