OMG....this was a long story, but very interesting....
Honesty, I think this lady has a serious problem and enjoys all the trouble she makes for guys....she's creating so much bad karma for herself....that's so sad what she's doing...going after guys who are married or engaged and then make them to break up with their love ones and then at the end she will leave them too....
I would suggest you to stay away from her as much as possible....why are you looking for headache? Isn't it any other woman out there? I know lots of women looking for a partner like you and you can make them happy instead of this woman who makes you and others misrable....
Why do you care even? She doens't need anybody's attention and care....She's not doing good to you or others...probably, somebody should tell her....
just stay far from her....and don't digg into her life or whatever she does, because she's an adualt and she doesn't need your help....
Your kids are more important than anybody else....I even think that she is the cause of you getting seperated from your wife? Isn't she? why don't you stay and try harder for your marriage for sake of kids? Is there any possiblities left in your marriage?

take care of yourself and stay away from her...she's an absolut poison and you don't need her!

with love
Marjan