Faithfulness

We heard on the news that the San Francisco Mayor Newson had an affair with his campaign manager's wife. Since marriage is also a binding contract between husband and wife, each individual should be commited to the person who they married. I think the government should make it illegal for people who cheated during their marriage. You may think the person who got cheated has a choice to divorce the other person. However, this person may still have financial responsibility to the person who cheated on them. Under the California marriage law, whoever has a higher income will have to pay alimony to the other. The issue of fidelity won't even come up in the marriage court. IS THIS FAIR? Why would an indiviual get penalized for nothing he/she has done. In my opinion, the government should impose some sort of punishment on these people. I'm not saying they should serve jail time because this will just cause more financial problems for the society. Perhaps, community services would be a good idea. What do you think on this issue?