Which behavior should I have around my boyfriend's sister if she is around?

brekkiewrap
tbh i dont like the behavior of my boyfriend's only little sister.. maybe it was my mistake too at first cause I sent screenshot of our chat to my boyfriend but nothing that is too personal. i also never really send random screenshot if its not important (it was about my boyfriend's ex)

i was asking my boyfriend regarding the word his sister said to me, and i told my boyfriend not to tell her as it might cause some frictions between me and her.

and it happened, he told her he knew it. when i was trying to approach him about anything else, she was kinda against me, and i asked why also i apologized as i knew my boyfriend across my warning.

since then i never really like my boyfriend's sister towards her defensive behavior around me.. well I don't mind if she doesn't like me, but im just uncomfortable with her presence most of time...


anyway.. she is February Pisces and im September Libra.
Which behavior should I have around my boyfriend's sister if she is around?
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