The one?

How do you know that the guy you are with is THE ONE? I'm with the most amazing guy. I wake up every morning with a smile on my face, I feel so important, I feel comfortable, I feel genuinely happy for the first time in forever. I was in an abusive relationship for over a year and I now have this amazing guy and I'm pretty much convinced he's the one. But is there a moment or something about them that'll tell you they're the one?