It's wrong to stalk someone you have a crush on.
Greg likes a girl at school who is a new student there.
Greg wants to find out more about the girl.
Greg sits with her at lunch and chats with her as he has opportunity.
Greg becomes friends with her online, looks through all of her posts, and comments on everything she says or does online.
Greg and the girl slowly become friends and eventually start dating.
The girl sees that Greg is obsessing over her and becomes creeped out.