I disagree. He felt jealous when that girl confessed to the seme. And that was before that dick chocked him and walked out.
I think it's the opposite, actually. I think his relationship with the seme is making him realize that the "friendship" he had with that other guy was not normal or healthy. The seme has actually helped him come out of his shell and make friends whereas the other guy purposely isolated him so the uke would be dependent on him.
Bet you the dick is the one who started spreading rumors about the uke being gay to isolate him and have him all to himself.

Does yeomin actually like him? Or is this some sort of trauma bond. Did I miss him say he liked him? Cause it more feels like he’s clinging to him since the other guy left and “he has no one else “. Maybe I’m reading too much into it. I like the story tho