It sounds like you may think a little like myself. When you meet someone they can be perfect. Everything about them, their personality, their attitude, their looks, its all just perfect. You think you click with them like they are 'the one.' Then you mind will wander and think other things into 'what could be.' You will begin to overthink what is happening between you and them. Something goes wrong, you are hurt, and they don't realise that they have hurt you so much. Yes, what she did sounded very screwed up, and she was wrong. If the intrest wasn't there she should have let you know.
Personally, I have been out of the dating pool for over two years. We was in a relationship and everything was perfect. All of the sudden it was like the crystal ball of love was dropped and shattered into a million pieces. After that, I got too tied up into thinking, why? I kept overthinking our relationship and tried to figure out what
I had done wrong. Needless to say I ended up in counseling because of how messed up I had gotten myself. I wouldn't let
anyone near me, including family and friends, for fear I was going to be hurt. Counseling helped, and I started to get turned around. I still stayed FAR away from the dating pool, just because. Finally, yesterday after two and a half years I went on a date. I was so nice just to get out and have fun. I am looking forward to our next date.
If you need some time, take it, but like Davo said, don't loose confidence in yourself. Others around you can tell, and will stay away. The same thing is true about being desperate. Just go out and have fun. If nothing comes of it, you spent some cash for some fun. If something comes of it, you have a second date, and a third, and....
