IK the story is meant to be "oh he helped her through a rough time by being her emotional pillar and she loves him!!!" but honestly looking purely at the events and the character reactions without the framing of romance it reads more like a girl who is deeply emotionally vulnerable latching on too deeply to a one sided relationship. In reality, she would likely fall out of love since the guy isn't this idealised yes-man emotional cove that she's sorta made him out to be. Funnily enough, this is also what a lot of other romcoms make the FMC to be; some sort of surrogate mother to the MC that provides unending emotional support and sexual value due to their appealing appearance. They rarely if ever have any real issues of their own and their character revolves around the relationship.
That said, if the series was going off over realism they wouldn't have an idol still attending high school in such an obvious manner. Or the initial premise of the two being classmates meeting in an MMO, for that matter. So who cares, I guess. I just like it when my animanga slop series at least can do the characters - the only real constant across stories - well. But oh well, who cares.