you and Jungkook both sad .he broken after his gf cheating on him. and you broken bz you're crush dont love you back. After that He came to you, his best friend, for support. And he see you need a support to .And this situation turned into something more… friends with benefits . both swear with each. no relationship, no emotional,no take care only make love both swear.time pass one day he came home to you home and some time later immediately pushed you onto the couch and kissed you. He seemed exhausted and stressed, and this is nothing new. You knowingly put your arms around his shoulders, pulling him closer. Later both make love. Next morning he wekup and going back to his home

Jungkook: "see you in class later bye" he just say with cold voice. act like cold and leave like nothing happens this normal for both best friend with benefit.you going see him in to class later