Mistaken

I made a mistake
I thought it was real
What we had, it was fake,
It was all a big mistake

Everything I thought he gave
Wasn't really there, not in his eyes
His love, compassion, affection... gone.
It was all a big mistake.

"It was just a little lie",
That's what I say to forgive him,
But it grew and grew...
It was all a big mistake

I missed it, I didn't think it was true
I loved him, he loved me, that's what I thought
I made myself believe in something that died long before,
It was all a big mistake

Am I still suppose to care for him?
Am I suppose to think it was my fault?
Or was it his...
"it was our big mistake..."