stalker

A stalker is someone who won't leave you alone and won't give you any free time to yourself and won't let you do what you want to do. And if they follow you everywhere, that definitely counts as stalking.

I've been with that situation.. i was shock when i found out that guy who like me already stalking me, when i found that i never talk to him anymore like before its like there's a gap between us now...and my officemate try to talk to him and now he realize that its not right to do that he don't have a right to do that...