Do you know for sure that he's still contacting her? It really sounds like she's grasping at straws by doing what she's doing. He's comfortable talking to you about her. Is there any chance of mentioning to him that you'd like a restraining order? Maybe that's a little out there, but she does have issues and I'd worry about what else she might do.
Sounds like you two are on the right track and are healing well. Hopefully someone can give you more advice on how to get her out of your life.
SueS
ME: 42, H: 42, D6 Together: 18 yrs. Married: 15 yrs. Attended Retrouvaille - December 2009 Status: Working on it day by day