Rejection hurts but I must say that learning this DJ mindset has help me be more resilient to its pain. I was sorta surprised, because I thought learning DJ will help me score chicks easier. But instead, my success rate is the same... but the rejection doesn't hurt that much.
I agree with AlwaysExcel. You also lessen the pain when you don't put your girl at a high pedestal. Think about it, if you were to get rejected by a UG4 (don't know why you want this in the first place, but let's assume), you won't get moved. But a girl that you somehow idolize will be more painful.
I know this isn't the best way, but I always focus on the negative of the girl when I get dumped. Example, she's has bad body odor, so I focus on that and think.... thank God she dumped me, I saved my nose. The more you go over it and find other girls, the faster your recovery. A LTR (over 1 yr) takes a couple of months to heal for most guys on this site.