My sister was talking about me

So told my sister something very very sensitive and personal that only she & I knew . I didn’t tell anyone else I told her cause I trusted her . So I just found out that she was talking about me to her friend real bad and she told her friend what I had told her and that was very personal . Her friend went back and told someone else & that person went back and told my child’s father & it got back to me . I’m so hurt because she lives with me rent free , I pay all my bills in my house alone , her & her 5 kids stay with me . When I get money I always make sure her and her kids have things . When I buy for my kids I make sure I buy for her kids as well . I’ll even go as far as splitting my money with her and still have to be the one to pay bills . I have to clean my house up alone after I asked her several times can she try to help keep the house clean . Oh and on top of that her friend went back and told people what she told her and was talking about my sister to . So I didn’t tell her anything I just fell back from her . I haven’t been talking to her or replying to her messages and she texted me while she is in the other room and said why have we been so distance and do you need to get anything off your chest ? But my child’s father told me not to tell her because he don’t want to be thrown in the cross fire but he said he let me know so I can keep her out of my business . Like I’m talking we was suppose to be close like every time you saw her you saw me too . I haven’t even responded to her message because idk what to say , I don’t want to tell her cause all she going to do is justify it and make herself right and go off on the friend but at the same times she shouldn’t be telling no one my business and what goes on to my household cause at the end of the day if I make her leave , she has no where else to go but the way my heart is , I wouldn’t want to see the kids out on the streets . They tearing up all my furniture , broke all my tvs and she won’t work or clean up or even attempt to try to get her own place but I didn’t go around telling people that because that’s my sister and I had love for her. .

Update : I didn’t have to tell her not to tell anyone , it was about a sexual encounter that I had with someone and it’s something that person did that upsetted me and I confided in her because were very close . She should know not to tell anyone about that and not only did she tell that but she was talking a lot of trash about me and I’m all I ever did was try to help her like she can’t name one thing I ever done to her . I’ve never made her feel unwelcome or anything but I see she got too comfortable and telling what goes on in my life and in side my household . Like she told me lots of things that I never said anything about . Idk even know how would that even be brought up , there is no way to tell anyone that without being messy 🤦🏾‍♀️