Why does he act like he doesn't know me?

Anonymous

He used to obsessively follow me around and I used to reject him. Now we work in the same office. And he act like he has never seen me or total stranger.

Updates
5 mo
I mean this rejection happened years before. And I never held any bad opinion on him. at least he could say hello as a familiar face as anyone would when they meet a person they knew earlier.
Why does he act like he doesn't know me?
4 Opinion