I know. Deep breaths, and everything will fall into place the way you want it to. Even if it doesn't right away!
I've never been in a relationship but I do know that if he ISN'T the one, the universe, or God, whatever you want to call it, will play accordingly. It just means there's someone better out there for you. But keep trying with this nice person and see how it plays out. Best of luck to you!