Hello, I have my own bad marriage thread on here, but wanted to ask a question for a friend. He is a bloke and he doesn't want to have mumsnet account 
Most of us r female here but maybe somebody can advice.
Anyway.... He is nearly 40 and got 3 children with his wife. They don't love each other anymore and dont even wear wedding rings. Haven't been a "real couple" for few years.
He finally decided that the situation at home is no longer good for Anybody and wants a divorce.
Problem is the wife is being unreasonable, nasty and blackmailing him. She said that she will Never give him a divorce because she is very religious and its Against her beliefs, she said that she will get full custody of the children and he wont see them much, she will get big child meintenance and icing on the cake being that she will put on divorce pappers name of his best friend(!) as a woman he was cheating on her with. 
Now after all this he is scared to get divorced! He loves his kids, he earns avarage money and he doesnt want to put his best friend is a deep shit either. He is a good, decent man. Any advice? Experience