Jungkook gets into the accident but since Jimin broke up with him, just as the man promised, Jungkook only fractures his leg. Jimin cuts all contacts with Jungkook and his friends
Their friends hate on Jimin because of the unreasonable way he broke up with Jungkook especially when Jungkook needed him the most. Jimin by then had moved in with a senior who has always liked him and made that fact known even when he was with Jungkook
Six months later Jimin starts showing, making people believe that Jimin was carrying Taemin’s baby. Jungkook doesn't want to believe what his friends tell him but Jimin clearly did move on