what should I do

Saniyah

hello everyone.. I need your opinion. I have two girls I consider my best friends. been knowing them for years. but over the years one of them is my favorite.. I love her so much I call her my sister.. the other one said she considered me her best friend. but my favorite and I consider each other as sisters. we have so many memories and have shared so many secrets. my problem now is.. I told my friend something that was upsetting me.. I told her something my favorite told me about someone that is close to her.. I only spoke to my friend best when I tried to tell my favorite how what she told me didn't make no sense and I didn't agree to what she said she didn't listen.. so I spoke to my friend and the conversation came up. And I wanted to see what she thought...but as time went on my favorite told me she wasn't going to tell our friend.. I didn't think she would mind.. but obviously she do..now I really wish I hadn't said nothing.. nothing at all.. because my friend is now giving me signs.. that she may throw it in her face.. because these two haven't been getting along so well. what do I do.. if it do come out.. I would hate to lose my favorites trust.. and I wouldn't even know how to apologize.. I know I was wrong for sharing her business. I'm only asking you guys.. because she the only real friend I have.. I'm not much of a people's person..so my question was how do I apologize if it comes out.. or should I say something to her.. and let her know I told our other friend?