Most guys overuse smileys, try and lay off the smileys!

You probably have started the phone/FB-conversation too often and let her made you her puppy!

So, to sum it up: I believe you played it well, but left out the chance to make the next step! She was interested until you lost value by starting conversation again and again and not advancing to the next step - e.g. meeting her in real life again (and once again: that is my theory, correct me if I'm wrong!). And by the time she got negged on and on (and probably too brutal?) she might have gotten the feeling that you were just cliché idiot that is bragging about how many girls he has boned and is just going for the one-night-stands etc., with her on the other hand maybe trying to find someone for a long-term-relationship!
- DiplomATA -

Judging from what I've heard here are my thoughts:

I do strongly believe that the main fault you made was let the time bridge between seeing her back then and meeting her again become to big! When she met you, you were there, something she could look at and touch probably... as time passed by, she lost that memories and feelings and you just simply became a ghost that was texting her from time to time... I guess that was the problem!
Furthermore I don't know if it's true or not (might be mistaking on that part but might be another reason!) but you might have stepped into what I call the 'Puppy Trap'! You probably have started the phone/FB-conversation too often and let her made you her puppy! Kalel basically hit the nail on the head, just one thing I am not quite congruent with:
'it made it seem too serious and her natural instinct...'
I'm not sure if it was the problem that it was too serious! Correct me if I am wrong, but for me it seemed that the girl was really interested and I hardly believe there's a chance to make things too serious! As a matter of fact I DO believe that it was too much, but out of another reason: You lost value by reinitiating conversation on and on and not actually going for a date or something similar! That might have triggered some kind of 'He's a coward that only talks big but doesn't have the guts in the end'-feeling in her! What women basically (yes, I know, there are others too, but BASICALLY) want is commitment! If you talk about commitment but don't commit, well, she'll look elsewhere for someone who does!

So, to sum it up: I believe you played it well, but left out the chance to make the next step! She was interested until you lost value by starting conversation again and again and not advancing to the next step - e.g. meeting her in real life again (and once again: that is my theory, correct me if I'm wrong!). And by the time she got negged on and on (and probably too brutal?) she might have gotten the feeling that you were just cliché idiot that is bragging about how many girls he has boned and is just going for the one-night-stands etc., with her on the other hand maybe trying to find someone for a long-term-relationship!

Oh yeah and always keep in mind: If you blew it this time, you'll know it next time! The more you game, the more you improve!

- DiplomATA -

well... who cares if it was a hint or not? just take it as one and make the move (women like men who take chances!)!
as a matter of fact I think it was some kind of a hint (even if she didn't notice it herself!)...
you could have just said something like: 'well i'm going to meet up with my friends but if you want we could meet up for a drink first!' or something like that (but with an FTC, meaning that she could always meet up with her friends...)
could have made the deal for you!
as i mentioned: I can't really judge, because I just don't have the knowledge to! I know a bit ABOUT the situation but I don't know THE situation (catch my drift?)... so whatever I write here are just presumptions!
good luck!