Pshhhhhht you can't trust anyone these days anymore. It's always like:

A: cmon tell me !
B: no ! I'm not suppose to tell anyone.
A: awww cmon! I PROMISE won't tell anyone else..
B: but I told him/her that I wouldn't ..
A: you know I won't tell ! you can trust me..
B: .. okay okay I know I'm not suppose to tell anyone BUT ..


There everything spills out. And this just repeats itself until the entire universe knows.

Just one of those little facts of life. Moral of story: don't trust people.