Search Results: hugging from behind

Not too long ago my sister and I had a falling out and she wasn't talking to me. After a family meeting we resolved everything and from my understanding went back to normal after an apology and a hug. Fast foward months later she calls my house and asks to speak to my husband. I passed him the phone and he told me that she asked if he could give her a ride to the smoke shop. He asked me if I was okay with it and I said its cool.
A couple of weeks later my sister calls and I missed the call. I huried to call her back and said to my husband that I don't want her think I wasn't answering her calls. He then asked me why are we still arguing with eachother. I said we aren't. We made up already. He then told me that during the ride to the smoke shop she asked him if she was a good sister and why was I distant from her. She proceeded to complain to him about me and mentioned that she stopped doing my daughter's (who is also her god daughter's hair) a few years ago because of how I was with her. She also asked him to promise to not tell me what she said.
I was furious. I suspected for a while that she was never close with her niece and nephews because how she felt about me. She even blurted out 3x that I wasn't her sister. So she finally admited that she stopped doing something for her niece becausw of me.
I draw the line when it comes to kids, especially my kids. My blames my husband for telling me stating that he said it to brake the family up. I empathically disagreed and said that my sister 1. Had no place in talking to my husband about me and asking him to keep it from me. 2. She was totally wrong forusing my daughter to get to me by not doing something for her as an Aunt.
I would like your honest opinion. Was my husband wrong for telling me or was my sister wrong for talking behind my back to my husband and asking him to keep it a secret?
Please explain your answer if you can.