urgh the ML's friend is such a not close friend like does she not get context clues?

I think you're missing some. She has not been updated on literal 180 flip Jaehyuk has gone through and he *was* raging homophobe (even if for petty reasons) and raging womanizer (even if due to his stupid amounts of libido)
Its suspicious as all hell from side. Honestly if he still was such a jerk like he was before id be glad to be warned in Garam's place. (Can ignore that since this is a fiction, ppl like Jaehyuk dont change so easily like ever, it really feels like he hit his head) It feels icky only because Jaehyuk has done and said so many icky things and he has to own up to it.