Maybe it’s because she mentioned something about how he originally said “if I date him I’ll get tired of him faster” could be wrong tho(〜￣△￣)〜
I think he is concerned about Jaehyuk outing him and not being careful enough with who and how he talks about them and their relationship. Considering his trust issues, overhearing the conversation could also be triggering despite Jaekhyuk insisting on how serious he is. He could also be upset because of the never ending drama caused by Jaehyuk's friends. It is a very frustrating situation for a lot different reasons...
why did garam seem so mad? i mean jaehyuk litterally said so much nice stuff aby him so jaehyuk shouldnt be nervous abt what he said? unless i didnt read the room?