oh, I have one! My best friend's dad has been divorced for about 10 years, but was dating a woman he met through work for a few years. She moved into his house and everything, but one day they got in a huge fight (I think because she wanted to get married and he didn't want to) so she moved out and they didn't speak for at least 6 months. Her dad started dating another woman shortly after, but then she moved a few hours away so it didn't work out. A little while later, he got back with the first woman and proposed! I just went to their wedding yesterday and they looked happier than ever
And that same best friend dated a guy for a year in high school. He broke up with her before he left for the army but didn't say why. A few weeks later she found out from his new girlfriend that he left my best friend for her! My best friend was devastated but didn't contact him at all. A little over 3 months later, he came crawling back begging for her, saying he made a huge mistake and wanted to be with her. She denied, and still to this day (about 3 years later) he messages her every now and then! Not really a success story, but just shows how the dumper came back.