Spoiler
His brother had a really good reason to leave him all the responsibility. S2 he’s soooo swt
his brother didn’t run away, [SPOILERS]
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Renji went through the proper channels (talking to their father, transferring the heir position to his brother, going over to his ex-fiancés place to work for their company ) so that he could be with haru, even wrote him a letter explaining everything, which never got to him because eijis a brat who lied about why his brother was leaving to haru and mislead him all those years just so he could monopolize him, only to neglect him in the end
that's what happens when you don't cherish your loved ones. you snooze you lose, eiji kuuuuuun ╮( ̄▽ ̄)╭ (≧∀≦)