How common is a girl who will go back to her first love?

[Sci-Man]

First of all, thank you for reading this, it is much appreciated:

On a summer holiday, I came across a girl from the hotel who found me on a social media site, despite not talking to each other (she came on holiday not long before I left). We are both college students (I'm a year older). We have spoken to each other almost every day for 5 months via text message & occassionally skype. She's smart, nice, cute, and she feels special to me (unlike most girls that I have known). She smiles when I speak to her & seems happy.

We've been very close for those 5 months, and I really didn't want this to end. Recently I asked when would you like to meet up and she said in the summer, which I agreed to as we have exams before-hand. I said it would take time & I want to take it slow as it's difficult, but we can do it, and I might be moving not far from her to a University in September (possibly). I've asked this a few months back too so I kept waiting patiently. She seemed shy about it & barely made eye contact. We used to Skype a lot, laugh a lot and smile a lot. She said I felt special to her & always make her smile a few weeks ago, because she was really down about her education. Then, I made the effort to speak to her when I was on holiday so she wouldn't miss me. We've talked for ages & I've been nice to her, when she was down. However..

She has said I trust her & she trusts me & I would wait for her, but now I've asked to call her, she says she is busy, and says it more commonly. A week later without talking, she texts:
I'll have to blunt saying this but I want to end it.. It was nice to know you.. I'll struggle with distance.. couldn't cope going further... hope to continue still being friends.
She didn't want to call either which is more disappointing.
She has gone from messaging me every day to barely talking to me for almost 2 weeks and suddenly says this.

If I'm honest, I feel unbelievably sad and hurt, I couldn't believe it. Is there any way it could work or she'd come back to me in the future? I don't think she realises how much effort I put into this & what she is missing out on. It was a strange and 'selfish' way of ending it, and I'm struggling to move on. Will she still be friends? I'm not somebody who can move on from someone quickly, especially with my commitment.

[?]

I believe she is just protecting herself. If she falls in love with you the distance will be too much to handle. And she obviously wants you to just stay friends. Don't be hurt, because she just seems to know what is good for her and what would eventually break her heart. And one of them is being in a relationship in which she gets to see you once a month.
Hope you become truly happy though.
Xoxo,
Emma.