Wife and Husband relation

My friend is a govt. Employee having good salary. He has been married for last 12 years blessed with 02 children. He was a drinker but not as habitual. From last 03 to 04 years couples are fighting on and off. During this period my friend purchased a plot in wife's ownership. She made him to do so. Still he is paying installments of loan for the plot. The wife still not stopped fighting her husband. She is a very greedy lady with doubtful character. In there marriage conflict , I and other family members gone to there house to counsel them. Even the father in law of my friend counseled her daughter. But she never changed . The wife also takes whole salary on the very first day of payment. One thing is very strange in their conflict, Whenever someone gone for counsel , the wife never complaint of his drinking habit. Instead made false allegations of extra marital affair. My friend is very close to me and he shares everything with me. He never had any type such affair. Even any family member , relatives , society, or his office staff can give guarantee of his character. He is a very nice , soft spoken and helpful person. Only bad habit he have is drinking. I have seen him becoming a habitual drinker In last 04 to 05 years. Otherwise he was a occational drinker. I can't expect an extra marital affair from such a drinker person. But her wife is always torturing for the same , even so far neither she or anyone else has got any single evidence of his affair. It is purely manupalted by his wife to torture him. One very strange thing is , whenever the husband is drunken heavy , her wife don't allow him to enter home. That too knowingly that if she will not allow him to home, the husband having car will go in car and drink more. His wife and even everyone knows, that this person is habitual of driving miles with continuous drinking. This is very dangerous as the roads of Himachal are killer roads. This should be a very fearful situation for a wife because road accident is everydays news in himachal. But she intentionally don't allows her drunken husband to enter home. This shows that the wife herself wants him to drive in drunken condition. So that some untoward incident can occurs and she gets all benefits like govt. assistance of 4 lac that H.P. govt gives to the family of decreased. Also other benefits like personal insurance and all benefits of Govt. Employee. With this wife herself having some extramarital affair can't be denied. But my friend is not able to understand the hidden planning of her wife. He gets happy when her wife don't allows him to enter home . So that he can drink whole night , can drive whole night. But I really want to normalize their relationship anyhow and save my friend. What can be done... Please suggest...