I promise you over time you will get over her. My ex girlfriend, who I thought was the one, eventually changed completely and cheated on me; I'm completely over her and in-fact, I dodged a bullet!. I, for the first two weeks, was completely shattered... You have to look at the bigger picture. You won't be fixated over her for the rest of the life and you will meet another girl who you will believe is the one and she may be. Keep your head up and don't get dragged down by the emotions. Surround yourself with your friends and talk to people!