My friends wife has affair with a coworker after many years of Marriage with my friend. My friend is in absolute distress now over his son and daughters future. Wife has acknowledged a lot in detail about the relationship outside marriage, after being caught red handed with letters. She has had a very close relationship to the extent they considered each other husband/wife. She allowed him to tye symbolic mangal sutra, which she claims was not serious ceremonial affair. She expresses guilty feeling and rependence now fearing bad name, but everyone knows it is only to save her own self image and because she knows her husband is well to do and can give her all luxury in life. Obviously not out of affection. She and her boyfriend had planned to continue their relationship secretly if they were not caught for life. She is unemployed at present.
My friend wants to divorce, but does not want to lose his 3 year old girl child and 5 year old son at any cost, whom he loves very much.
Under the existing circumstances with his wife's affair coming to light, can he get divorce and retain the custody of his children for the rest of his life? What are his legal options?