What's on his mind? Why did he show interest in the first place and then reject my friend request?

Anonymous
There was a guy in my class who used to stare at me but never tried to talk to me. This went on for 2 months and then he graduated. After his graduation of around 1 and half months, I sent him a friend request and he rejected it. What does that mean? Why did he reject my friend request?
What's on his mind? Why did he show interest in the first place and then reject my friend request?
5 Opinion