What does settled even mean? You didn't find your 'soulmate'?
In this life, you meet a finite number of people.
From these people you meet someone who you get along with, fancy, who has faults which you can live with AND they feel the same about you. That's a tiny fraction.
You work hard to build a home together, probably parent kids together, negotiate the births & deaths and illnesses of people you love, which are an inevitable part of life. You grow together and hopefully see your relationship deepen with that increasing understanding of who you both really are, warts & all.
I think the concept of soulmates is whimsical & twee. It's pure luck if you find someone who compliments you so well that you're romantically loved up until the day you die. Average marriages/LTRs have really hard patches where you have to actively choose each other all over again because people aren't perfect & most of us are deeply irritating.
And I actually think those periods of choosing again are pretty special (once you're out the other side and content again & can look at them without wanting to kill them).