This guy, Chip (Harold W. Mosby) is a leader in our church, but he cheats on his wife, how do I stop this guy?

He is a parishone in my LDS church. The Bishop turns a blind eye, but this guy is ALWAYS hanging around the young women. There is this girl I have known for years her name is Lee Jordan and she had an affair with him. I know her well- she tells the truth. Anyway, she is just one of many many I speculate. I feel bad for the girls he uses, but how can I warn the girls or get the Bishop to take this seriously.