Well, they are not even dating properly but already have comparability problems. Welcome to real world.
Funny thing romcoms like to show us how protagonists manage to overcome all hardships and end up together as couple, but actually it's where the real challenge begins and like 80-90% of highschool couples break up in few months or maybe year or two. And of course there would be omake to show characters happy family life with children after 5 years together. Yeah, no, not happening. But who reads romcoms for realism anyway, right?