I don't know, I am not thinking in a big picture sense, just the situation you described. I guess if he was secretly feeding her polonium, it would be different. All of this is "IMHO", of course, but I look at it like this - a woman has to know her value, she has to know who she places her trust in, and the consequences of it are between them. SHe may even be ok with it, there are all kinds of people out there. Some people are ok with the patriot act 
I just realized, I would also make an exception if she is my relative/close friend.
Maybe i just have no principles, everything is a case by case. 
But w the situation as you described, I wouldn't touch w a 10ft pole.
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"Я это понимаю на рациональном уровне, но не могу принять на эмоциональном" --Бизнесмен Борис Березовский