LIke so many things, it's a numbers game. You have to realize that and relax and start playing the numbers game. It's easy to obsess and think you need to get THAT guy who you're hot for but who doesn't seem to appreciate what a catch you are. Truthfully, you don't need THAT guy. You were fine without him. So, forget about him and move on to the next one. Every once in a while, it will work, but it never works as well as you think it should. This is what the Buddhists call the reality of human suffering. Life is never quite what you think it should be.