A person who gets married and is unfaithful to their partner has caused a severe injustice to everyone. They should be held accountable for their indecent behaviour. A person has to be extremely immoral and unethical to go such extremes and commit adultery.
This reminds me of a business associate ( tycoon if I may add), he ( 50 years of age ) slept with his daughters best friend and made her pregnant, but ended up marrying her.TAKE NOTE ! The commnunity did not stone them. Not long after he lost his faithful wife,kids , wealth, respect and dignity. Thats how Immoral people lose the blessings in their lives. And thats what Islam tries to protect us from. Islam is not a religion, it is a way of life. Its unfortunate Islam is not practised wholly by Muslims, but thats our test. Be a prisoner of your desires OR control it.