Someone You Used To Know

I'm not gonna lie to you and say it didn't hurt.
To see you with someone new and you wearing my old blue shirt.
But it didn't kill me until we say hello.
And I became someone you love to someone you used to know.
Like a friend, like a fool, like someone you knew in school.
Didn't we love, didn't we share or don't you even care.
I know we said we were through but I never knew how quickly I would go from someone you love to someone you used to know.....