Kelly Clarkson - Behind These Hazel Eyes Lyrics Meaning

My interpretation of this music video/song:

Well, I'm originally the person who did this:
Welll, What is going on in my head is:

Kelly is getting married to this guy, who is secretly in a relationship with this other girl, but he still really loves Kelly. Then, at the wedding that other girl is stupid enough to blow a kiss and the guy is dumb enough to smile, and Kelly see's, leading her to have more than enough evidence to know that the guy was not the right one, even though she really likes him. Then she makes a whole scene and blows off the wedding. Thanks my interpretation of this song and music video.

And I missed something I wanted to say so:

Yada yada yada, even though she really likes him, thats where i'll start.
Even though she really likes him. The guy feels so bummed out, because you can see he puts his hands to his head in a sort of manner like:
"Aww god I messed up..."
So you can see that he is, indeed, not happy with his choice, but he knows he'd be happy both ways, but doesn't know which way to choose, and Kelly is one of the many choices being dissed.