Don't know Everything

When I said I knew you
I guess that I was wrong.
You broke my heart before
In yours, I don't belong.

When I said I knew you
I thought I knew it all.
I thought you would be there
Everytime I would fall.

When I said I knew you
You were only lying to me.
Bu I knew you wouldn't listen
And I knew you couldn't see.

When I said I knew you
I didn't know inside
I thought you would love me
And not let feelings hide.

When I said I knew you
I didn't know it was a fling.
No I know it is true
People don't know everything.