I'm a bit confused because the situation you described is litterally a miscommunication. When someone says a thing, and the other person understands another thing, and then reacts to that other thing, that is a miscommunication.
A lot of romance (especially formulaic romance) relies on quiproquos for drama, and if you read a lot of romance, as romance readers tend to do, it gets stale really quickly. It's a lot harder to write genuine drama between a couple that communicates effectively, because in your example if character 2 had just said "that makes me feel like we're doomed and you're going to dump me as soon as highschool is over" then they could have had a conversation (which could lead to them planning long distance or even breaking up earlier for their own sake). More adult oriented romance drama usually has tension resulting from people actually doing something wrong (sometimes that "something wrong" being not communicating and lashing out and learning to mature) but working through it or even is just from purely external stress factors but the couple itself has good healthy communication.
Also a lot of this quiproquo stuff is used in highschool dramas because surprise surprise teens don't communicate effectively, and as a romance reader as you grow up those types of arguments start seeming petty and stupid because you feel like the solution is right there, like how when you're in primary school 1 hour feels like a hellishly long time, meanwhile in college 1 hour is short. Perspectives change. Undoubtibly some of those people typing "communicate" are slowly aging out of highschool romance drama either through actual age or overexposure to the trope and don't realise they're getting bored because they're not that type of teen anymore.
TL;DR : it's an overused trope and readers are bored, don't sweat about it.