how did a friend on my facebook hack me so quickly?

[Stella]

Your password is probably something easy for a friend or family member to guess at. You say this is someone you speak with a lot on Facebook, so he probably figured out your password over time. He just didn't say anything. In fact, he probably does the same thing with everyone he knows on Facebook.

First thing I'll say is that you need to change your password to something random that no one will be able to guess at. Make it a mix of upper and lower case random letters, numbers and symbols. Whatever you do, don't tell anyone, or even hint to anyone, what it could be.

Second, I need to tell you that this is NOT your "good friend". You need to lose him. He has already proven to you that he can't be trusted and that he will stop at nothing to control you. End the friendship before he does some real harm.