Is she a bad friend/ untrustworthy?

So I told one of my best friends(we will call her angie) that i cut. Another friend(we will call her Jess) of ours told us that she almost did. I was talking to Angie and was like you've been like depressed talk to me. She told me she was drinking and then she said (this convo was on aim btw) "I told my mom that you cut, and I told her that Jess almost did." My response was pretty angry. I said "wtf, why would you ******* tell your mom that. Good ******* Bye." (in all caps) I told her not to tell ANYONE. especially her parent. So what should i do? What would you do? Also I talked to her about it and she said "You didn't give me anytime to explain myself" and i was like why are you turning the tables on me. That's not the problem right now. blahbl hlablha. How Should I deal with this?