How did you know she is the one?

How did you know she is the one?
I get asked this question severally by my dating friends. Ernest, you married Waturi but how did you know she was the one? How do you know you did not marry the wrong one? What if the one is out there and you missed her? If you get a divorce doesn’t that mean she was not the one? If you argue and fight doesn’t that mean he/she is not the one? How can the one act like that? I don’t feel the fire in the relationship anymore; I don’t think he is the one? Before I...