Have you never had a relationship that no matter the time apart and the distance between it never changes and if anything simply highlights how much you truly care and miss a person? You realize well crap I really love them and I have more appreciation for the time we will spend together. Its not like Rui was going to be gone forever. Also why does HE have to give up his goal of going to Paris? The literal CAPITAL OF FASHION. Why didn't you say well if Yuujirou had such a hang up about the distance he could have easily applied for architecture programs abroad. Like? It would have also solved the issue.
You talk about realism, technology HAS made it easier for long distance. I do not see my family for months at a time since I work abroad but knowing I can call, video chat, sends pictures and videos sharing my daily life makes me feel closer. In contrast, I've lost friends who I see every day just because we simply dont communicate and friendship dies down. Its all about the effort you put into the relationship and clearly our couple is head over heels and willing to put in the work.
I think the Author just wanted to showcase that even after the turmoil Yuujirou was facing at the end of the day his love and his faith in their relationship brought him out to the airport. You say hes chill about it but to me the only thing the scene showcased was how much they cared and were willing to do to have a future together. Sure it seems cold of Rui to say I'm still leaving but do you think by the way the author showed Yuujirou's character he would not feel guilty at some point that he basically kept Rui from achieving something he was looking forward to? Would it not basically undermine Ruis opportunity of growth and depth and simply stay the bubbly whatever my boyfriend wants character?
IMO Rui going through with the decision of leaving was a good showcase of our sweet couple's love.
Call me a cynical pessimist but reality just isn't like that. Humans are fickle shallow creatures, we like to think that love is stronger than anything but it's just a chemical reaction in the brain. Yes, with effort we can maintain most relationships but it's not forever. You could die literally at any moment, a fact I feel people forget alot, why would you want to spend any large amount of time apart from someone you're that in love with? Every second with them is a literal fucking gift. And maybe my definition of love is different but I'd give up everything to be with the one I love, I know I'd do it because I have, and the only thing that has ever ruined my relationships is distance and the fact that my love was always more absolute than theirs. (And that includes my family)
Yeah, maybe you're right; maybe they could make it work in reality, and everyone's just happy and they live the rest of their lives together in blissful ignorance. I've just never seen it work not for my sisters, not for my friends, and not for me. But hey, they're special, their love is stronger than anyone else's because life is just all rainbows and sunshine and happiness right? ╮( ̄▽ ̄)╭
Clearly I can see the cynicism. You keep saying reality but you're just pushing YOUR POV to the situation. I mentioned my own and you've straight up dismissed it. Also being in love with someone does not mean you give up your own self for a person. Dreams, hopes, opportunities, it can lead to resentment later. Why do people have to give up things instead of trying to make it work?
The distance made the relationships fail because again maybe one person put in more effort than the other to maintain it.
Its not ignorance. If anything YOU are the one being ignorant, sure life isnt just happiness but why be so stubborn to think their relationship wouldn't work out in the real world? Idk It just feels like you're projecting your life onto the story and are upset their relationship shows it worked out even with the distance when it didn't work out for you.

Yuujirou was 100% in the right, idk why people feel like Rui would've had to sacrifice his whole career and future to stay; he could've studied design in Japan. Long distance relationships are not made to last, irl ones hardly ever do, the ones that survive only make it because of frequent visits. Humans are a social creature, we form tighter bonds with those in our immediate circles than we do with those we never see, it's just a fact. The digital age hasn't made long distance relationships any easier, they just give us the illusion that it has.
I get that Rui wanted to better himself but his desire to go to France was rooted in his own personal insecurities; he could've just as easily built up his confidence and independence in Japan next to Yuujirou. I feel like after witnessing Yuujirou struggling emotionally and physically with the possibility of separation and then just saying "I understand but I'm still not gonna change my mind" was a bit irritating. I understand why he did it, I understand what his motivation is, but this is stupid.
Why couldn't he just stay?? If his only hang up is an Inferiority complex then just get over it, it's not worth the emotional anguish of your spouse, it really isn't. If we're weighing the different options here based on reason alone, his was a dumb one. I feel like the author was definitely listening to that one song "Grow As We Go" or whatever it's called when they were writing this. Or rather that they should've taken the lyrics to heart and kept our boys together, cause if we're going for realism here then realistically they would've grown apart and eventually either broke up or struggled to recover their relationship from the damage the distance caused. I know fairy tale endings don't happen often irl and things don't always work out like we'd hoped, but I don't think I'll ever not be annoyed at how the author resolved such a heavy emotion in Yuujirou with a simple "I understand but I'm going anyway" and all of a sudden he's chill with it. (¬_¬)