
Bro is acting like a kid begging his crush for attention by bullying him

It's a spoiler. I read it prev year, so I cannot recall everything properly. But the situation is:
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Renato and Maximilian (idk if I spelled correctly) have been childhood friends, with Maximilian always harboring feelings for Renato and hoping to make him his mate once becoming adult. However, when he shared about it with his mother, she told him that an Alpha could not be with a Beta—at least not in Renato's empire. It was then that Maximilian realized Renato was actually a Beta rather than an Omega and stated bullying him which was kinda funny since he had been the one to assume otherwise in the first place. Feeling betrayed by this revelation, Maximilian began to despise Renato, and the rest unfolded from there.

This is why communication exist

Sure but it's not easy to broach a topic about how one is valued if you suspect that the person only sees you as a tool. Especially when it's the only reason you're together in the first place and you have had no time to form a relationship outside of that context. They barely know each other well enough for him to easily risk that kind of vulnerability.
Your boy "friend" is having a crisis boy!