Because Jaekyung is a douchebag and doesn't deserve Dan's love. But for Jaekyung is just because he doesn't want relationships
Well I know that but like I'm asking because ik some stories be like "say I love you and we're over" or "say I love you or ur fired" (〜￣△￣)〜
I think in this case Jaekyung didn't give much thought since he's aware that Dan is not being himself. Tho if Dan says it seriously, I belive Jaekyung would just get pissed and still have sex with him but probably be overly cruel just to try to wash off any romantic feelings Dan has of him.
Someone remind me why Dan can't say I love you. My brain has stopped working after that one chapter.