The worst two I've had aimed at me...Background required....
My late husband's first wife acquired a boyfriend, so DH left her. Friends and relatives bought her story that she'd been abandoned and had gradually become close to a work colleague.
DH and I got married about 8 yrs after his divorce, 10 yrs after the separation. (At the end of the 2 yr separation, the ex actually asked DH to go back to her.)There was a big age difference.
She tried to spin the narrative that DH had left her for me, a younger woman. (Ironically, her boyfriend was younger - but he looked about the same age.)
I was always fairly plump. At one point, I lost my excess weight and finally was able to fit into nice clothes.
DH and I were invited to a 65th birthday party. When I got there, I realised to my horror that DH's ex and her boyfriend were also there. Still, I did my best to mingle, etc.
At one point, DH wandered off to speak to a pal. Immediately his back was turned, his ex homed in on me, in front of all the matrons in the hall.
"My! What a lovely dress! What a lovely colour! Mind you, you can wear it...being so YOUNG!"
I simply thanked her politely and she flounced off.
Cut to some years later. In the meantime, her BF had died. The chap whose birthday party we had attended had been widowed and she and he had become an item. Mainly because of her newer partner's influence, the relationship between us all became a bit more cordial.
The newer partner died. I felt sorry for her and took her to hospital for a day procedure when it became obvious that the kids weren't going to step in and help her. The kids became a bit nicer to me.
In the meantime, she acquired yet another man. (Less than a year between each death.)
My husband died during lockdown. The kids asked whether it was okay for their mother to represent them at the funeral. (I later found out that it had been her suggestion. Her latest man dropped her off and picked her up.)
I got a phone call from her before the funeral. She was friendly enough. Then: "Don't worry if you get some of the details for the eulogy wrong. I'll be the only one who knows."