"What? Ann, I am SHOCKED!!! I'm sorry but I don't think we can remain friends. I trusted you."
My 2nd:
"You are no longer invited to my movie night or birthday. Please do not ever contact me again. I am EXTREMELY disappointed in you Ann. It was NOT your place to get into my PERSONAL business.
I can't even believe YOU of all people did this to me Ann. You should be ashamed of yourself."