You missed the most important thing, he never learnt to control his pheromones or knows how he would react to alpha pheromones because suah non consensually coated him in his own pheromones. Suah was overstepping from the moment they were kids and juhyeok only just found out. Little to do with jealousy, suah was being a little shit and deserves the cold shoulder.
Well tbh he could have learned but since he was so stubborn and was in denial Suah had to step in to protect him. We saw at his birthday the way he reacted when other omegas tried to give him advice. He lets his own insecurities and stubborn ways get to the best of him. It is still technically Suah’s fault but he was a kid…
I agree
Reading the comments, y'all are forgetting something important. This is an omegaverse, yes, omegas react easily to other alphas pheromones at least they're covered with another alpha's to "protect" them. You may say that is shit that Juhyeok now is dependent on Su'ah's pheromones, but remember that he can't control his own pheromones well, he is not even taking pills. It's not something he can stop just with willpower even if he wanted to. I think its pretty valid that Juhyeok is mad about his secondary gender, bc he thinks that it makes him looks weak to others, so he doesn't want to depend on others but himself. And he rejects Su'ah so much bc again, he doesn't want to depend on him or look weak, not bc he hates him, but maybe bc he feels jealous of the fact that Su'ah is an alpha and doesn't have his same problems. And Su'ah just wants to be by his side, not only because he worries about Juhyeok, but bc he LIKES HIM A LOT.