Love of my life?

Once upon a time, a girl, a common girl called Greta. She was a dark girl, but she wasn't a bad person, she had dreams, friends, hobbies... She was a normal teenager, but, she wasn't in love, she still didn't have found the correct boy, she ever was sad and she was unhappy.
She was in the university, so that was the time to grow. She moved to a new department, now she was completly alone, she was an independent girl. The department was so dark, just as she liked.
The first night there was terrifying, there were noises, cracks, shadows. That night she could not sleep. 
At next day there were more noises, more shadows, more cracks... she felt very scared, but at the same time she had an extrange feeling of protection. 
In the midle of the night she was in the bed, she was sleeping, but suddenly she heard a voice close to her ears. It was a voice of a boy, a teenager, the voice said - who are you?... who are you?... who are you?...- .
 Greta woke up very scared, she couln't see anything, she was in shock. In the midle of the dark appeared a boy, a handsome boy, he had a black shirt, black pants, black shoes and a white tie.
Greta said-Who are you? What are you doing here? I'll call to the police!-
The boy screamed- No!, I'm not who do you think, I'm here from 200 years ago,You can't call to the police beacuse I'm die!
Greta: That's not true!, You're crazy!, Get out of here!
Boy: Don't you believe in me? I'll show you!!
The boy started bleeding until he disapeared. Greta started crying and screaming as if she felt the same as the boy.
 Greta: Stop!!! Stop!!!! aaaa!!!...
In the morning Greta woke up, all was normal, there wasn't blood, there wasn't pain, everything was gone! 
During all the week nothing happened, all was normal, there weren't noises, cracks, shadows, now the place were pacific and comfortable. Greta was happy because now she could sleep again, but at the same time she felt a sadness, really the boy was a ghost, and she couldn't help him.
After three months the voice returned, but now, the voice said -hi!... I'm back!!... I lo...-
Greta: Hi! Where are you?? Can I help you?? What's your name??
The boy: Hi... I'm Derek... yes, you can, I have something to tell you...
Greta: What?
Derek: I'm sorry, I think that I scared you, that wasn't my intention.
Greta: Ah! Don't worry, I'm fine.
Derek. Why didn't you ran like the others?
Greta: The others?
Derek: You're not the first person who has been here.
Greta: Oh!! That's true! Come, I can't see you, let's talk!!
Derek sudenly appeared. Now he was in his normal form.
Greta: That's better! How old did you had when you died?
Derek: Wait!!, first, tell me, why didn't you ran like the others??? why??
Greta: I like ghosts, and you didn't make me something bad, you just showed me how do you feel, or not??
Derek: Yeah!! You're right!! You're the first person who understands me!!
Greta: Ha! But.. you still don't answer, whow old did you had when you died?
Derek: 17. Whow old are you?
Greta: Really!! I'm 17 too!!
Derek: Great!! How long you'll be here??
Greta: I don't know.
Derek: That's right, nobody can knows what will happen in the future, we just now that we'll die one day, hahaha well, you know that, because now I'm die! 
Greta: You feel so sad and alone, right?
Derek: How do you know how fell??? Are you a psychic or something like that??
Greta: Nooo, It's just... Sometimes i feel like that. I feel dead.
Derek: Maybe you'd say me meddler, but in all this months i coul know you perfectly, all this time I watched you and... I have to tell you something...
Greta: What?
Derek: I... l...I lo.... I love you!!
Greta: What?? But you newly sarted taking to me!!! How can you love me??
Derek: Just like I said, I've been watching you, I heard you, I saw you, I  knew you. Now I can see perfectly that I love you!!!
Greta: Oh!! But I don't know you, and the most important, you're dead!!
Derek: Does it really matters?? Maybe this is the destiny!! You'll can love me as I love you! In all my eternity I've never seen a girl like you, you're special!
Greta: ... Ok, so give me time!
Derek: Oh! Great!!I'll see you tomorrow!
Derek kissed Greta Sweetly and then he disappeared in a bery bright light.
At next day Greta were waiting for him but it was in vain, he never came back.Greta never could find other love like Derek.
One day when Greta was returning home(now she has 24 years old), a car ran over her. She died.
She went to the heaven, she turned around and... there was Derek!! The reason wich he never came back was that....  THE END (You should to find the answer)