So, someone I know from Church is going a divorce right now. As is the usual arrangement, he has no say in the matter. His wife is actively having an affair and is now seeking a divorce. It's a sad situation, to be sure, but it does have me wondering what the Church's prescribed course of action in similar situations would be.

If a man's wife is unfaithful, particularly if she is actively and unrepentantly unfaithful, I don't see how he could possibly continue to live with her. On the other hand, separation (even without formal divorce) would seem to be the sin of scandal. On the other hand, continuing to live as normal while your wife openly cuckolds you would also seem to implicate you in scandal, to say nothing of the personal pain involved.

Were it me, I'd be sorely tempted to view suicide as the rational and loving response to the situation, as it would spare the wife the expense of legal proceedings, grant her access to more resources through inheritance than she could get through alimony, and it would relieve her of the sin of adultery while granting her new relationship the possibility of marriage within the church. Yet, despite all this, I feel quite certain that suicide is something the Church would frown on.

What's the right thing for a guy to do in this situation?