Being stood up can be devastating, especially after all of the time it takes to get ready and time spent anticipating the date. Going on a date can be a nerve-wracking event. A person wants to impress the person they're with and have a good time.
If you are stood up, the first thing to do is make sure that it wasn't a misunderstanding. Check the time and place of the date to make sure you didn't make a mistake. Additionally, give your date the benefit of the doubt, and don't immediately set-up a dartboard with their face on it. They may have made an honest mistake, or they may have had an emergency.
Wait thirty to forty minutes before you try to contact your date. Also, if they mentioned they might be late, give them even more time. Contact your date only once, and, if they do not show up, don't stay at the venue. It will only make you feel worse.
If you date does contact you, think about whether or not their excuse is logical or believable. If they had an emergency or work issues, think about trying again. Try rescheduling the date if they contact you before the end of the night, seem apologetic and have a good excuse. Also, ask yourself if you're truly interested in getting to know them better.
If you get stood up, don't think your night is ruined. Call up a friend, and make new plans or treat yourself to a shopping trip or a meal at your favorite restaurant. Don't beat yourself up about this: It's not your fault if you were stood up. Instead of thinking there's something wrong, realize that this is a testament of your date's character and not your own.
The best reaction is to move forward and not try to overanalyze the issue. When it comes to being stood up, it could be a sign that things wouldn't have worked out anyway. If the two of you are meant to date, it will happen. Don't try to reschedule if they're clearly not interested. Acting desperate is not a good sign for a relationship.
Shy people may not always be receptive to your flirting, but you can tell if they're responding.