Our expert says:
The short answer would be to see a good local psychologist who practices proper CBT ( Cognitive-Behaviour Therapy ) to help you gain control over your unpleasant feelings and reactions to this apparently unpleasant woman. That is possible to achieve. If you are right about her dislike for you, probably the most frustrating and unsatisfying way you can react to her is by not reacting and showing no distress whatever. If she's a nice person, she wouldn't be bothered by this at all ; if she's as nasty as you think, she will be very bothered by finding that her manipulations don't bother you at all.
As presumably her aim in being around at every opportunity would be to annoy and bother you, she would be disappointed if this is obviously not happening, and might see little advantage in finding more ways to be around you.
Many of us have friends from school days, but few of us would spend quite so much time with them as your brother and his pal seem to do : that aspect of you story sounds slightly odd, but maybe neither of them have bothered to develop any other or more recent friends.
You have no duty to be friends with this woman ; but neither do you have any requirement to waste your time and energy hating her. Let her be nothing to you : don't pay her the compliment of allowing her to be significant to you.
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