We all have our little secrets Slappy. Nobody here will tell!
The "one and only"... definitely a myth! Every relationship is give and take, compromise and share, do what you can. Sometimes, maybe it just takes 6 months for the realities to set in?
If anything the "one and only" should be ones own self. That's the one person you can't divorce or walk away from.
Living alone, I've been able to appreciate many different people and things around me. Once ya got the knack for love, independently of anyone, then it's not the needy love that keeps relationships together anymore. Then it's the mutual interest and conscious decision that makes a relationship happen. My theory of the day.
Take it from me. I know all about this stuff (not!).
As a friend of mine yells: "Prisoner of Love. Out on bail!"