Did I put my friend in the middle?

Ok so my friend is my boyfriend sister. So, when me and him was having problems I would go to her all the time. She knows ever thing that happen in our relationship. She was my friend so of course I would go to her, even though that is his sister. When I broke up with her brother we remain friends, to be honest I guess I used her to find out things about him. Before we got back together I had asked her to tell him to not contact me anymore that I was done with him. She didn