What happened to us?

I thought it was too good to be true
I found somebody who understands me
Someone who would help me to get through
And fill an emptiness i had inside me

But you kept inside and I just denied
Some things that we should have both said
I knew it was too good to be true
Cause i'm the only one who understands me

What happened to us?
We used to be so perfect, now we're lost and lonely
What happened to us?
And deep inside I wonder, did i lose my only?