Am I doing something wrong?

ok. so when i was in 6th grade, there was this girl who bullied me all the time. She told me that no one likes me and told me I was such a crybaby. She even called me a person who she can throw her stress at. And she did apolozie, and I'm not sure if I should take it or not. This happend in Korea, and she contacted me when I moved to America. She is all so nice to me, but she chats with my friends by facebook and always asks me about why I tag my friend even though its not something important. So I told my friend about what happend to me and her, and my friend said that she's not going to be her Facebook friend and not going to chat with her anymore. Am I doing something wrong by telling her what happened between me and her?