Important or used?

How important am I to you?
What do you think of me as?
You seem like I'm just another face in the crowd.
Like I'm nothing specail.
How am I suppose to trust you if I'm nothing to you?
I'm heartbroken.
I'm dying on the inside. 
I see you happy with everyone else.
I can't even talk to you anymore.
You've completely changed.
How do I know you're not using me?
Just because you say you're not using me, doesn't make it true.
Am I just your back up? 
My mind is a confused wonder.