Nice to see you around again, Ana. Where have you been? Hope everything else is fine even that ex-friend you just shared is quite twisted. Don't let it get to you. She's not worth to count as a friend. Believe me, a real friend, on or off line, never does something like that to another friend. A real friend would have explained his/her reason before walking out of your life.
And I know how it feels when someone treated you like that, for the same thing happened to me. I talked to one girl for a while online. I even introduced her to the guy I like once since I thought of her as a friend. I believe I never had any ill wishes or thoughts towards her. Just out of the blue, she was gone and never replied to my messages. Not even a short explanation about her behavior. Just poof... gone. I was very confused. I had no idea and still have no idea what I did or said wrong.
If I knew her in person and she did this to me, I would be in her face and annoy the ~ outta her until she told me what I did wrong. That's how I am. I don't walk away when someone I know gives me a bad behavior, especially when I believe I've done nothing wrong. If I and that person were in a fight, I wouldn't give a ~ if he/she refused to talk to me. It's childish. I don't associate with childish mentality.
After some time I started to stop caring about her behavior and health. People come and go. There are some you only meet them once, but they leave you with such an impression that you'll remember them forever. And there are some you've met for a while, yet they leave you with such an impression that you'll forever regret the time you've spent with them.
Well, it's life. Live and learn. Until then we'll grow.