The boy in my window

This book is about a teenage girl named Emily. She's some what popular at her school Central high. After school she's in a group talking to her friends and a boy she never seen before comes and asks her out and she rejects him.The next day another boy asks her out an she's says yes not knowing that it's the same boy as yesterday just in disguise. As Emily starts to notice someone is stalking her, she tries to tell someone no one believe's her.