Somehow, you perceived this as a woman as a lady
who once had interest in you; but from the way I look at this, this
wasn't even present right from the start.
Being intimate doesn't suggest anything seriously - to kiss a fool
may be stupid, but to let a kiss fool you is worse.
Therefore, for her to leave a man she never had feelings for - why
not? In fact, she didn't leave you; she just decided not to remain
in contact. You see, you can't go 'out' if you are technically not
even 'in' right in the beginning, so how can you claim that she has
left you?
Also, who are you to her, may I ask?
Nobody actually - an online friend at best.
Why used the word 'betrayed'? You do not even have the status to
condemn that charge to her, other than being fooled into thinking
that she is into you. Looking at different perspective, your
kindness is pretty much a facade too - expecting something just
because you are 'nice'? 
i AM NOT USED TO IT. i HAVE GROWN SO ATTACHED to her by
now
What's this? Just because you are not used to it and just because
you have invested time and money into her, she has to like what?
Marry you? Or have sex? 
***
I am not trying to hurl stones at someone who has
just fallen; I am letting you visualise the backstage process in
your blind pursuit. In fact, this love is narcissistic; you are
almost like in love with yourself because everything materialised
as a mirage - surreal and nothing substantial.
You were thinking along this plot: met a girl on the internet, she
was in bad shape and you, the prince, came over and saved the
damsel in distress. Got closer and a great love fostered.
Everything in which you reckoned, ended up flipping into the real
chapter of the story you never knew it existed.
Her plot were much simpler - met a gullible guy, suck what I need
from him, dump him before it becomes too much trouble and
NEXT!
And you claimed to be heartbroken over such a woman?
Should you slap yourself awake? Or should you suffer more and let
your cosmic lesson do the teaching? 
Cheers