Zarry - Guardian Angel

Harry was lead to drugs and alcohol by his boyfriend, Dean. Soon after, Dean got obsessive and abusive. Harry lost all contact with his friends, and was hardly ever with his family. But then he's sent an angel, when he's at his lowest point, at the point of giving up. A guardian angel; Zayn. Zayn saves Harry, almost, and they develop feelings for each other, But then Zayn isn't who he turns out to be, causing Harry to relapse. Can he be saved once more?