Regulus loathed a lot of things.
His father, the fact his brother had just left him to suffocate in that damned house of theirs, the Dark Lord and all of the idiotic things that would slip past his lips and illicit an eye roll from Regulus, and so many more things. If there was a God of Hatred, Regulus would claim that title without even trying. One wrong intake of air around him, and he would scowl at you like you just wished death on his family.
One little thing took the cake, though. He hated you more than anything else in the world. And that said way more than it should have.
Perhaps it was the way he managed to uphold his role as Head Boy for Slytherin over the years, while the Head Girl’s would switch around, except you’d always come back and pester the fuck out of him on security checks. Maybe it was how intelligent you were — always actively threatening his chance to be the smartest in every class, taking the podium only to be knocked right off his precipice, by a girl, nonetheless.
Or how he would constantly have to be around you, because your family became one with the Sacred 28 all those years ago, automatically making his family close with yours, which led to seeing each other at balls, gatherings, dinners, quite literally anything that involved socializing, and he would purposely get drunk off his ass just to have a reason to escape the night and spew anything he wanted in your face.
Whatever it was, Regulus Arcturus Black loathed you. Your name was underlined in his journal under the label ‘Hate List’ in bold, red marker, three exclamation points next to the last letter, and circled.
Regulus, in short, wanted you out of his life. For good.