Do you think my friend backstabbed me?

Long story short, my friend and I met in college and we became really close. Then comes along this other girl, (I’m going to call her “C” to make things less confusing). C and my friend become really close, which was ok, because I had other friends who I became super close with. As time went on, C and I had a few arguments and just didn’t like each other. My friend knew that. I told my friend something personal, and one day C brings up what I told my friend, and uses that against me and almost got me in trouble. I was upset at my friend for telling C my business when she knows C doesn’t like me. However, my friend made it seem like she was just casually talking to C and didn’t think that C would use what I said against me. Anyway, do you think my friend backstabbed me?
Do you think my friend backstabbed me?
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