You’re not going to change your boyfriend’s sister anytime soon. She’s jealous and immature. The more you talk to her and ask her to stop annoying you and sabotaging the relationship, the more she’s going to dig in and do more damage.
My advice is to tell your boyfriend about the problem and ignore his sister as much as possible. Sometimes obstacles like his sister can bring you and he closer together! Don’t waste any more negative energy on his sister. Instead, focus on all that’s good between you and him and try to enjoy the relationship rather than giving credence to annoyances like the sister.
I hope that helps! Let me know how things go, and join me @AskAprilcom on Twitter and on Facebook at this link: [url][/url]. 🙂