Bro. Gets over it. This incident happened 10+ years ago. Like many said, lots of fish in the sea, just because the fish you like ran away doesn't mean you are a loser for life.

And again, the thing happened between you and the girl you can considered it a normal friend outing. Don't let the outing (or you called it as DATE) to ruin your life any more. It is ok to feel down for a short time, but 10+ years and still stuck in this is way too long...

Bro, don't get me wrong. I do not mean to down play any one. We are human, it is perfectly normal to have emotion. We may feel sad, depress on and off, here and there. It is ok to feel down for sometime... we should not let this negative emotion to stay for too long. and 10 years is way way too long...

And I seriously think that perhaps expanding your social circle, get some hobby, keep yourself busy could be helpful. Leaving yourself too much time, you will think more and more about this incident in the past.