<human>: So I've met this girl a couple of months ago, we started dating for like 3 months, but it never gotten official because I knew she wasn't sure about her feeling. I told her I respected her busy life and that there is no pressure and I like just having fun with eachother, and she said she also enjoyed it to be with me, and that we could just go and take it slow.

Recently she said her feeling is too clouded, and she's not sure what she's feeling, and that there's some sort of wall arround her that she needs to break down. In order to do that she wants to work on herself and continue as friends and see if something grows. She said she was sorry, because she knew I was very sweet & nice, but her feeling just didn't cooperate. 

I immediately thought it was doomed, since stuff like that won't just grow imo.  So I told her I cannot be friends because I like her very very much and it would only give me false hope and hurt me more. She accepted that. Since then I broke contact.

Now one month and a bit later I still think about her everyday. I just can't get her out of my mind and it's so annoying. 
I do plenty of stuff, I work out 5 times a week, I play bass, I play videogames online with friends on skype. I occasionally visit friends. 
But it doesn't seem to work.  

I think it's because I'm afraid of ending up alone. Since I never had many girls, it hurts so much I lost another I liked very much. And I don't understand what caused her to "break up".  I don't know many girls, and I don't get to meet many new girls at my daily activities, so I keep thinking about this girl.

Is this normal? How long will this take? Any tips beside the standard ones?: "go out more, go meet new people etc."

Condense the text into a few key points
<bot>: Can't get the girl I dated shortly out of my head because I feel so much for her. How long will this take?