He's not me

I should have seen the sign way back then
When he told me that you were his best friend.
And now he's rolling, rolling, rolling
And you were stolen, stolen, stolen.
He started dressing like me and talking like me
It freaked me out
He started calling you up in the middle of the night
What's that about?
I just want to be there when you discover
When you wake up next to your new lover
He might cook you breakfast and love you in the shower
The flavor of the moment, 'cause he don't have what's our.
He's not me
He doesn't have my name
He'll never have what I have
It won't be the same.