How to prevent your husband from getting other wives outside (Part-1)

A lady (married 6 years with three kids) recently got the shock of her life when she discovered that her husband was married not only to her, but to two other women in different cities.

The man in question was able to hide his " triple lives' by faking numerous bi-weekly trips out of town claiming to be away on business. uwillcgossip.com

He also has two kids by one of his Illegitimate wives, and the other woman is expecting her first child with him.

Long story short, nemesis eventually caught up with him when he got into trouble with the authorities in one of the cities where these women are. And trying to escape and not face the consequences led to many investigations, and eventually to the discovery of these other lives that he has been living.

The criminal case against him ( the one that led to this whole discovery) is still pending. However, no charges were brought on him for marrying more than one wife as the marriages was proved NOT to be valid. Even the judge who married him and the other women is not even a real court appointed judge. It was all fake. The only real marriage is to the wife of six years.

So question;
(1)how much leash is long enough to give a man?
(2) Ladies, how do you prevent such things from happening to you?
How would you handle a situation such as this one?
What would you do if this had been you?