He Ask Me Out I Refused; Now He Is Snubbing - Lady Cries Out

This is a story of things fall apart NYSC version. So a lady on social media claimed that a guy asked her out but she declined, she however tried to become friends, but the guy keeps ignoring her.

In her Twitter post, she stated that NYSC will soon be over and he's still ignoring her even though they stay in the same house.

Why do some guys do this?