Breaking the Rules

I really thought I knew
But I was sadly mistaken
The advantage over me
You had easily taken

The wool had completely
Covered my eyes
As I fell for all your excuses
Promises and lies

You were so dame convincing
Played the part so well
All the while pretending
And I could never even tell

Until the day you faltered
And let your true self out
I finally got a glimpse
Of what you were about

I couldn't really believe it
I didn't want it to be so
But now that you're exposed
I have no choice but to go

I will no longer be made
To look like a fool
And never forgive myself
For breaking my own rule

The rule most important
That was number one on my chart
To never completely give
Someone my fragile heart