Can someone explain to me how normal pairs differ from fated pairs?

I think that normal pairs are like you choosing your partner for life without “destiny” being involved so its all your choice. And the reason why most people choose their partners instead of waiting for their “destined” partner is becuz theres not a high chance if them ever finding their destined one in thier whole life. So everyone has a fated pair, theres just not a high chance of them ever finding theirs.