If a man, who is married from 19 years and he has 5 children but still he cheats his wife. Once he wants to marry a woman without the permission of first wife. He continuously cheats his wife from previous 10 years. Then he leave that woman because his wife caught them but from sometime He again make a relation with some another woman and again cheats his wife. He beats her and not fulfilled her demands but he gives time, money, love , care etc for another woman instead to give this all to his wife. His wife caught him again but he still do same work.He also have sexual relationship with that woman which is non-mehram to him. In this condition, What is a punishment in Islam for this type of man who continuously cheats his wife ? What Wife should do in this condition?
A married man if commits sexual intercourse with some other woman Islamic punishment for him is stone to death. You should approad court to get him punished as per law.
She could sue him for extramarital sex, given that she finds more witnesses (doesn't seem too hard if this man continually cheats)...
The easiest solution would be to divorce this man, if she finds her situation unbearable.