Wasn’t here a story with the Chazon Ish or Steipler, where an older boy came to ask for a brocha for a shidduch and they said that they already rejected their zivug? So I guess people should not be too picky.
Al pi kabalah, there is a zivug and there are also basherts. Hence, you might not marry your zivug, but you could still find your bashert.