Who sings the song to these lyrics?

Just as friends
Never thought that we would end up like this.
Now my heart was for you
Can't believe that I found a love so soon
You don't care for me
You don't understand what it meant to me when you were my man
Not it's over and you don't comprehend...

I don't know who you are.
You're not who you used to be.
I remember when you used to look at me differently.
Now, you don't talk to me.
Boy, you can't even see.
I miss who you really are.
I can't see how you've gone this far.
You don't even know me now.
I see I need to leave.
Boy, you just lied to me.
You're not the one for me.