[AbreuTime]

Whoa, serious post. I feel compelled respond. My instincts tell me 3 things:

1) your relationship with the female will probably be over
2) you need to let her know the truth, without passing judgment on her or insinuating she should react in a particular way
3) you need to make sure you are safe

As for 3, hopefully others will have some ideas. I would probably do something like email the husband to let him know you have alerted authorities about his actions, and if you are harmed then everything will point to him. Then inform the wife what happened, with the full expectation that the friendship with her will probably end. "I dont expect you to believe me, but this is what happened. I'm sorry for the pain this will cause, and I will be there if you need me."

EDIT: Phone records will corrobrate your version of events, but dont throw them at her right away. The important thing to consider is her feelings/safety.