That's rather different than invoking "suspension of disbelief" or locating the problem in the character's psychology (or cognition, or whatever you want to call her failure to understand what's going on)--comedy protagonists in serial stories are often characterized by what would be repetition-compulsion or dysfunctional perseverant behaviors in real life.
Suspension of disbelief is essential for comedy or rather fictional stories in general. If an aspect of the story is so amiss that the reader feels a dissonance, it is most likely due to the broken suspension of disbelief. I will not critisize Scooby Doo characters for being unable to tell at first glance who the disguised criminal will be. They are portrayed just that dense.
The issue is connected to something you mention here...
But the writing problem here is that the MC is entirely passive and reactive
Our protagonist here is not portrayed as a completely naieve fool. At the end of each chapter she does either slightly reciprocate or give a disgruntled reaction, completely unlike the unaffected Shoujo protagonist she is made out to be. I cannot suspend my disbelief that someone with these reactions will reset her expectations every chapter. In the first chapter she implied that this has been going on for a while and that it bothers her. Her inner monologue nearly completely avoids ever addressing her relationship with the "rival", instead forcing the focus on her crush and his relation to the rival.
If she truly did not understand that her "rival" is trying to get her affections I could see it as the Garfield-esque one-gag comedy it portrays itself as and never question the status quo. It is indeed the glance at something more that destabilizes this construct. If it changes along the lines I will be more invested. If it does not, then the "dissonance" will grow and my patience for the running gag will wane.
last edited at Dec 13, 2021 2:15PM