I've been reading a book that had two childhood lovers who were separated come into contact a decade later, only to decide to keep apart because they grew too different in the intervening years. It's the kind of conclusion that is undoubtedly realistic but is pretty sour since, at least personally, I like the idea of them rekindling their relationship. It made me think of when those cases fit well and when they fall into the "subverted my expectation" pitfall. Of course it depends on the medium and intended reader, but most media falls on the spectrum between realism and drama. Also I'm not limiting it to only cases of romance, but every event that transpires, with the romance being the much less unlikely result for dramatic effect.
Fucking love this trope. Two kids are friends; they leave their hometown to give real life a shot, fail one way or another, and return home to (re?)kindle a romance. Realistic? Sorta. If you truly fall through in life and have no other prospects but to hit up old classmates, it seems realistic that you may end up meeting a person in the exact same spot. Adult and experienced in life, but without any social circles and thus having the time available to entertain this one unique relationship that may end up romantic. And obviously it happens. Hell, a new coworker just said she spit with her man after 12 years, started chatting up an old childhood friend and now they're dating.
On the topic of sour realism? I love it even more. The Tartar Steppe is about a dude being stationed in the mountains for decades and at one point he returns to his hometown, meeting his old friends who all moved on but also his friend's sister who is for some reason still waiting for him (sorta). He thinks up all these quirky things to tease her with, clearly able to win her over, but he simply does the whole "ah.. oh? yeah.. haha". So much time has passed, they simply lost their chance. They are one sentence away from ending up together, but the reality is that they aren't fit anymore. They've not grown further apart by having each their own lives, but they've grown distant by time simply passing. A bud left withering past reparations.
I watched a generic netflix coming-of-age story in which a guy dates a girl, nukes go off, they run to nuclear bunkers, but obviously he gets split up with his girl. They meet later in the post-apoc world, both of them single and tethering on the idea of getting back together, but even with her having no secondary romantic interest, they simply decided that too much time has passed and it won't work out. Why? Time, simply. Being one sentence away from flipping your life upside-down for the better is my favorite trope to hate, and Normal People, both the book and the series (which is fucking great) is the epitome of this. Two people who have been banging since teenagers constantly fucking over their obvious chemistry because they rather self-harm by fucking it up over and over. And they keep meeting, and they always ignore everyone else in favor of each other, again and again, and they just never act on it. It hurts so good.
