Was blocking her out of my life the right thing to do?

It's alright not to want to talk to someone for whatever reason. The wise thing to have done would be to have been completely honest and sincere with her - this translates into giving some sort of explanation for what you were doing. What you did was childish, cowardly, dishonest and just wrong.

Now you've left her hanging: wondering what has gone wrong, and whether you were going to be going back to being friends.

Perfunctory displays of contrition notwithstanding, anyone possessing even a single atom of compassion would, I think, find themselves hard pressed to be less than unequivocal in condemning your conduct for the unmitigated, abject and consummate moral failure it represents.

So: either accord her the minimum consideration that courtesy and decency demands, namely an explanation which will absolve any misplaced self-doubt arising from your—as yet unaccountable, but otherwise not wholly indefensible—decision and thereby allay a potentially catastrophic blow to her self-esteem; or be forever resigned to the reeking cesspool of wretched, craven, degenerate humanity where you currently reside.

This is an ultimate reckoning of your character and ethical backbone as a man; there can be no third option.

Is this how you talk in real life, or is a persona?

Substantively, inasmuch as I've an appreciably wide vocabulary and all-pervading penchant for grammatical contortionism; yes.

Literally? Well, I have my moments, but all told, Stephen Fry can probably rest easy on his throne for the time-being.

Baad idea dude. Bad idea. That's all I can say from the story which you have posted about your so-called love life.

The girl's crazy about you. She can have ANY guy she wants. But wait, no, she rejected them for you. You must be very special to her. But wait, no, you leave her because you FEEL like a long distance relationship wouldn't work. Seriously. They can. Anything can work as long as you love her and she loves you and you have complete trust in each other.

Now ask yourself this. Do you love her? If yes. Talk to her. If no. Talk to her and explain why it will not work.
Simply distancing from someone or blocking someone out of your life completely is not good. It will leave her confused, hurt and angry. Love can turn into hate VERY quickly.

I knew her for 5 years.

She invited me to her Prom which was in another country. She told me that a lot of guys had asked her out (she's beautiful and probably very popular at school) but she turned them all down so that she could go with me. She dropped a hint and I accepted.

During the visit her best friend came up to me and said "You have no idea how much she talks about you. I know so much about you already - she can't stop".

I ended up blocking her because I wanted to move on... I knew because of the distance nothing was going to happen... we wouldjust have this long distance thing and it would hurt me.

I've seen her since. She constantly tries to talk to me...

Did I do the right thing.

But we both agreed that a LDR wouldn't work - it seemed like she didn't want one.

I did love her, I don't know if she loved me. I knew she was attracted to me and had feelings, but I never knew to what extent.

I saw her the summer after blocking her and she didn't seem angry... she was always looking at me, always trying to talk to me and was asking people how I was and stuff.

We weren't just friends for crying out loud. Friends don't ****.