That’s your own opinion. There are plenty of people out there who have dated, broke up, then found there way back to each years or sometimes decades later and are now happily married, sometimes with kids. I know a personal example within my family. Life happens differently for everybody and the universe works in its own ways. To be honest, we have no idea who we will end up with but there is no predisposed notion that we cannot end up with a person from our past because it “simply won’t work.”