And let's be logical here, masking JuHyeok's scent with SuAh's benefits him MORE than it does SuAh.
He won't get attacked.
He won't get nauseous from alpha pheromones.
He'll be in tip top shape.
And he won't need to get stalked around by SuAh that much (since he already has peace of mind that JuHyeok is safe)
I understand his need to prove himself but there are literally people willing to help you. They're not your enemies at all.
If Suah didn’t shower him in hormones then he probably could have had a better grasp on reality. But since Suah kept showering him in his hormones he now has no choice but to rely on someone who he doesn’t want to be around. Even if Suah was doing it to protect Juhyeok he could have gone about it in a different way
"Who he doesn't want to be around"?
When he literally proposed to him when they were little? Asked him to be his mate?
The only reason he "hates" him now is because he can't accept that SuAh became an alpha and him an omega, which he despises.
The inferiority complex is messing with his brain from realizing that people just want what's best for him and to protect him.
But yes, I do agree that SuAh should lay low on the stalking. His efforts are being looked down and nobody should ever be made to feel that way.

The only enemy here is Juhyeok's inferiority complex against alphas. SuAh was only doing his best to protect the person he promised his life to. And yet Juhyeok's only response is hatred towards SuAh for being "better" than him. SuAh just literally wants to make sure he's alright and won't get attacked by other alphas.