I think that part was more of a flashback than an actual happening. That's how it came through to me at least, given the different outfit too.
Nope. He already move on from her. Junhyeong just have regrets that soon will be sorted to his ex gf. There will be multiple flashbacks for the next chapters, look for different outfit so that won't be confusing.
thank you this really reassured me oh my gosh i got so worried
Don't worry! Junhyeong never want to be back with his ex gf. His regret also not because they're break up, but because he was immature at that time. The talk with her is to acknowledge his past mistake and apologize. Junhyeong just being mature.
There's a scene the ex try to seduce him when they're still together. Instead of feeling the rush, Junhyeong feel nausea instead. When they're fighting too, the ex force him to have a talk, but Junhyeong not in the right of mental state so he fight so hard not to vomit right there and then. Both Junhyeong and the ex just aren't compatible for each other. It's just worse with the ex keep making remarks of how she help him so much, which just trigger Junhyeong trauma because his dad also did the same thing. So there Junhyeong break off with his ex in ugly terms that become his regrets.
he still likes his ex gf?? i mean i know his bf and his ex gf kinda look alike but wym it made you happy im really worried