I kinda understand as I had DH's exGF here for a while. They were about 8 years ago when they were like 15 & 16, & I've been with him for 7 1/2 years now & I had no problems when I first met her 2 1/2 years ago. I really liked her til I asked her to stay with us as she was having major family problems. I found out after she left that she was telling all my friends & DH's family lies about me & she was following him around making him coffee's & stuff like she was desperate for him to get back with her. she was here a total of 4 weeks & finally got the hint that she wasn't welcome anymore with out being told & left, but it still gets too me.
We haven't seen her or anyone in her family for about 6 months, but they are family friends of DH's family & I can't avoid them forever, but she doesn't know I'm pg yet & I kinda don't want her to know as I think she will use it to her advantage if she has the chance.
She knows DH wants a boy & she has a boy to someone else but she gave him DH's middle name which I thought was wierd right from the start.
Thankfully there are no kids together, but I am having enough trouble coping as it is without a link between them. And I know he has no interest at all. But that's just not enough for me.

I know where your coming from & I think I know whats going through her head - sabotage. But you guys are stronger than that. She will get her own life eventually & leave you alone. You just have to be patient til then for the sake of DSS.