Objectively speaking, some girls have more values than others (i.e., they come from a good family, good morals, intelligence, looks, ambition, etcetera). Sure you can move on and find another girl that is probably better (it's a big word), but after some time has passed, why wouldn't you try again on this girl. As long as you don't put her on the pedestal, and know that your chances of getting rejected again are pretty certain to happen, why wouldn't you try? They probably only rejected you because you came off as too overbearing in the first place. But, I'm curious to know why most PUA highly discourage guys from trying again on girls. Nonetheless, you were rejected before, so you probably won't feel heartbroken again.