When did she reject him? I need to know where you read that. lol I don't recall that ever being addressed?
Also, if she wanted Gun so badly, she would work harder to be with him. Gun even went to Jun to ask for advice because she is so preoccupied by Jun kissing her and completely avoiding him. Don't you think she would've ran to Gun and said let's make sure we're okay if she was so into him?
i think she and Jun share past of prob being each other's first loves (holding hands in flashbacks), and they agreed in the end it was too much and stopped saying this was just practice. It probably stopped around the time of high school, and then, we have Jun clearly using Ginny (Ginny even nailed that) to forget all of it.
Normal people don't react with such jealousy towards significant others as they do. I don't buy it's one-sided at all. And in this situation how they grew up, I don't begrudge this happening because no one understands them as they understand each other.
i mean it's so frustrated how JHHM keep trying to deny their feelings. so angst angstttt and just be together already :((((