"Today, he told her that he loved her, Put a ring around her finger"

On the day my ex got married, I woke up to this song....
(keep in mind Gary Allan sings this song)

"Today he told her that he loved her
Put a ring around her finger
And promised her forever, forever

Today, she smiled for all the pictures
And he was right there with her
Making all the memories without me

And it hurts to say this out loud
Look like she's really gone now

Today is the happiest day of her life
I should be happy for her today
So tell me why are these tears in my eyes?
I know I should be happy for her

But I've lost everything
I've lost everything I've ever wanted today

Today I thought about the moment
I could of said I loved her
And promises her forever, together

Today, today is really hit me
That she doesn't really miss me
She's found a new beginning

And I'm wishing
I had one more chance
God knows it's too late for that

Today is the happiest day of her life
I should be happy for her today
So tell me why are these tears in my eyes?
I know I should be happy for her

But I've lost everything
I've lost everything I've ever wanted today

Today is the happiest day of her life
I should be happy for her
But I've lost everything I've ever wanted

Today he told he that he loved her
Put a ring around her finger"

So what do we think this means.....