Eclipse... Roll = X.
Anyway, on the situation... I think the friend should probably avoid this girl. He can tell her to give him a call after her marriage ends (which it inevitably will, based on this saga).
I mean, sure, he could hit it with this girl, maybe even without guilt, but it is wrong by society's standards. And it will only bring drama...
There are plenty of hot single girls out there. I'm sure he can find plenty that he has things in common with.