You said it yourself

Trivial relationship. I get feeling awkward because you stopped contacting her all of a sudden but you said it, it was nothing just mere passerby goodwill for YOUR IMAGE. Kang is kyuho's friend someone he resonates with beyond just a simple relationship. This isn't even sexual just pure friendship and understanding. It's not something you can cut because your "fuck buddy" is an idiot and jealous. Time and time again you are together for sexual reasons not on a defined romantic label. If you yourself has stated this was just a temporary relationship and you don't want any deep feelings to develop then don't expect that he has to sacrifice everything to your whim. He's not your property. You're not some god or king. You don't own him. Honestly kyuho is just such a saint and mature person. But he has every right to end everything but he didn't because he did treasure the feelings he has accumulated towards you. ML is so spoiled and arrogant.