Both the Law and the Wife were unfair.

The Wife

The wife cheated on her husband, she also did not attempt to approach the husband to discuss what she did, instead turning her sin almost into an excuse making herself the victim and seeking comfort for doing something bad from her husband. That is the behavior of a manipulative co-dependent immoral person.

The Law

The husband did not kill her. He did not know she was going to commit suicide, he simply went to sleep. When he woke up, he reported it to the proper authorities, what else could he have done? This was not neglect of someone in dire need. She was crying. People cry all the time, that does not mean suicidal.

For all we know, the man going to sleep and being fairly apathetic towards the other boy/man was his coping mechanism. Having been in a co-dependent manipulative marriage for as long as he had. For all we knew, he needed the time to think and suppress his anger in order to collect his thoughts and maintain his mature composure moving forward when conversation did happen (if ever).

I'm not sure why this is even a question that should need to be answered. According to the law, and according to societal norms, the husband is not at fault in any way shape or form. The wife was a cheater that handle her sins badly. The man was a victim that handled his burdens in quiet reflection and maturity. The law was wrong any way you look at it.