The bro wasn’t being a bad guy. He wants them to stay together because he saw what happened to them. Granted, the relationship they share isn’t the same, but I don’t really understand Shuusei’s reasoning 100%. He’s a bright student who’ll get into Japan’s uni, which is on par with some of the top in the world. At that level, it will still be competitive enough to give them a good future. What’s in America that he can’t learn there? LDR is manageable, but it should be something that they talked about. In fact, many couples break up or don’t commit to waiting for each other after talking about it. The possibility of growing apart or just getting used to being on your own is high, and they aren’t married yet so expectations are different. The bro knows this so he’s worried about Shuusei’s decision. But I watched the live action for this manga so I know how it ends haha, I’m just confused about the timeline in my memory.