My H and his brother rarely see or message each other but when they do meet they just click together. But my SIL is always horrible to me from the moment we first met. She never does it in front of the rest of the family but waits til she can get me alone, e.g. under the pretence of helping in the kitchen. She is definitely a man’s woman so I’m guessing she sees most women as competition, whereas she is always really nice to my H. I have multiple qualifications and had a very successful job but she has never worked so maybe she sees me as a threat? I just don’t know. But it wears me down to the point that I don’t want to invite my BIL to stay as I know she will come too. But I feel guilty about this. What should I do?