If one woman (or possible more) rejected you, was a coward or had to rush off unexpectedly...for whatever reason...why should you let that affect your having fun, being positive attitude or even ruin one day? This is a simple matter of correcting your perspective.
As hard as this may be to grasp. You will never know why she did that. At this point, it doesn't matter, either. Clearly there was something that didn't work out and likely wouldn't have. Try to let it go and not obsess over this or memories of your past.
Stop cooperating with events that help make you sad, increase your self-doubt or feel depressed. Stop cooperating with self-doubt to make you feel negative. Your desire has to be find a new situation that has more potential of giving you happiness.
Think about the next time...when the next worthwhile lady who'll be worth taking the time to cultivate a friendship and go off into the sunset with a smile.
[Edit: I see by your previous post you have a long-time self-image issue and a lot of self-doubt. The advice others gave you before and offered here still applies. Don't allow others small-mindedness to validate your lack of self-confidence.]