Dumped? Yes. Once. I flew 10,000 miles to see a guy I had met where I live and who’d gone home. At one point, he would call every couple of days and beg me to come see him. He told me he missed me. I show up and three days later, he dumped me. My return ticket was for 5½ weeks hence. Imagine. Some gall, eh? At the time, he claimed to not understand why I got so angry. And for years after, I thought that I had done something “bad” to “make” him dump me. We no longer speak, but I do hope that he has since grown up and learned what he really wants out of a relationship.
Rejected? Yes. Many times.
You can’t take any of it personally, you really can’t. You have no idea what’s going on in someone else’s head that manifests itself in dumping you or rejecting an opportunity to be with you. You just have to accept that a relationship between you is not the right thing, then, and move on.