Wow, some of the most sickening scenarios...the kind that makes your stomach churn. I'd want to know. As hard as it would be, I would probably tell my friend. Living a lie sucks. However, reality can sometimes be much harder. Such actions call for HUGE decisions and change relationships forever. In rare cases for the better. Oh boy, since you are asking you must have a huge weight on your shoulders. I feel for you and the one you are speaking of. Truly.