And all of THAT in your OP @PippaRamadge is the reason why I have NO friends who I see regularly or socialise with. Just 3 friends who live 15, 25, and 45 miles away who I see 5-8 times a year, and speak to on Facebook. I have found most friends to be useless, unreliable, bitchy and catty, or just obsessive and weird. Literally, the 3 who I see 5-8 times a year (who I have known 20, 30, and 45 years,) are the only sane ones I have ever had! My 'social circle' is my DH, my 2 adult DC and their partners, and 4 or 5 neighbours who I chat to 2-3 times a week over the garden fence, or at the bottom of the driveway. I am in one hobby group, in the market town 4 miles from me. No friends there - but I do chat and have a coffee with 4 or 5 of the members once a week. (Well, they're sort of friends, but I don't see them outside the group...)
I don't have hassle or bother from anyone these days, as I have no extended family that I am close to. Brother and his wife moved abroad (6000 miles away on another continent,) a decade or so ago, and I have seen him once since, 2 years after he left, he popped back for 2 weeks. And many of my extended family are dead. Just got a handful of cousins who I have not seen for 12-ish years, since I left the area. I have Facebook contact and exchange Christmas cards with my brother and his wife and 2 DC, but only every couple of months, they are rarely on there, and I'm not on it much either. He also has zero contact with our cousins and their DC and partners....
I did try to keep in touch and visited them every couple of months or so for the first 2 years after we left, but none of them EVER came to me, so I stopped. I only moved 35 miles away, not 6000 like my brother! Not seen them for about 10 years, and don't even exchange Christmas cards now. DH is the same, parents and grandparents passed, brother and wife also moved abroad - 15 years ago, and he has no contact with any extended family, (except his brother and wife and niece,) not for about 2 decades now... They just all drifted apart, like I did with mine.
All my aunts and uncles are dead, and so are my grandparents. On both sides. My cousins could be dead for all I know. I don't think anyone would let me know if they were, as I don't follow any of them or their adult DC or anyone from my old town...
tl;dr, sorry I'm rabbiting on!!! I have made a handful of friends in my village in the past 11-12 years I have been here, and each one turned out to be a dud. Either just stopped bothering with me, or turned out to be a fruit loop, calling and texting constantly, coming to my house within 10 minutes if I didn't answer the phone 'to see if I was all right' and constantly wanting to socialise and go out and meet up with me. Not to unlike your very odd Single White Female type of friend @PippaRamadge !!!
I have no decent advice though sorry. I found the only way to stop/get rid of this weird obsessive friend in my village was to ghost her. It did involve leaving 2 of my hobby groups she was in though, and I lost 3 other friends in the village, as she turned them against me. (This was about 7 years ago, and it was about 6-8 months before she stopped badgering me.) 2 of the friends who 'took her side' have left the village now though, so her friendship group is dwindling! (The 2 who left probably left because of her!)
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