have you ever felt like being betrayed by your sister?

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i am a trustworthy person, you could tell me a secret and i could assure you that that secret will never be spread without your approval.. that is why i really hated those persons..whom i trusted the most..betrayed me.. my sister found out that me and my boyfriend went to an outing with his friends without my parents knowing that i came along with my boyfriend.. then there is this instance when she almost spit out my secret to my mother in front of me.. is it right for me to get mad at her?or should i tell my parents about that so there is nothing for me to be afraid of..? but in my opinion there is nothing really bad which i have done..