Instead of just staying with the douchebag at the apartment, thinking "oh he is my friend and just being nice" causing misunderstandings, Gyuwon was like "fuck thus guy, I'm out of here" and than goes and tells his bf everything. And as for Geon instead of not trusting Gyuwon he did even if he was jealous, who wouldn't be? And than he of course got angry at the douchebag and telling Gyywon he was upset and jealous but not that he didn't trust him, they both communicated so well these past chapters. And Geon will not take the doechebag's shit lying down.