Being fair and impartial

Guys,there is this saying that when you bullied someone in high school years ago and made their life hell on earth,when you ask them for a job in your company but he rejects you because of what you did to him,he is being petty and unfair because of a vendetta.Personally I think that because hata kama ni vendetta ,do the right thing for him and your job.You don't have to be friends but you can be his boss only not his friend.What do you people think of this?