Our expert says:
something to consider here which may be difficult at first is to ignore her when she makes these kinds of commnents. When she says these things if she is met by no response at all, yes it can create an awkward silence, but why should you have to explain yourself to her? Also why let her create tensions between you and your bf? She may be his sister but if the two of you have chosen to be together she cannot get between you unless you let her.
Try ignoring completely when she makes these kinds of comments and see how it goes. Feel free to come back and add another question if you are still struggling.
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