Your used to be

Your used to be that's me that's me
I was your was she is your is it's plain to see
I'm not your now oh pity me
For I've become your used to be

Every time you kiss me
It tastes just like goodbye
And I can tell that my best friend's
The reason why

When we're out together
You say there's nothing wrong
But when she's with us you're with her
And I'm just a tag along

When I introduced you
I made my first mistake
I loved you both and both of you
Made my heart break

Like musketeers
We always roamed about
But like they say three's a crowd
And I'm getting crowded out
Oh I've become your used to be