Should I?

Should I tell?I told her I wouldn't
Should I break my promise?
Do I know that I shouldn't?

She told me last night
On an Internet chat
I thought she was joking
thought I'd leave it at that

But there are others who know
whom she told as well
I asked them for advice
They said I should tell

I don't know what to do
She's sitting in the room
She looks perfectly fine
But the secret looms

I'll lose her if I do
I'll lose her if I don't
I made a promise to her
I won't break it, I won't...

...I hope.