Oh, for fucks sake, another "girl that the MC will have absolutely no interest in and only exists to stall because him and the FMC are a 5 minute conversation away from dating".
Hey, Japan, free revolutionary advice, maybe give the girl with relationship problems a relationship where she can actually learn and grow instead of one that is doomed to fail and leave her alone by the end.
Mangaka will do annnnnnnnything to add losing heroines to their story, ESPECIALLY when they already like each other. Most likely going to be a confession into immediate ending kind of manga - zero idea how to write a story without this unnecessary and cliche side interest.