My male friend is 41 and has been married for 17 years. Him and his wife married at 18, he is six years older than her and already had a string of buisnesses. She was homeless and had nothing and he put her through law school and she has been a well established family lawyer for 10 years.
He frequently works abroad for up to a week at a time, home for a day or two and then flies off somewhere else.
anyhow, a few weeks ago he called me and said that he thought something was wrong with his dw. she seemed to have changed.
He works with internet/phone security so was able to check her emails/calls etc. She had been away for a week on holiday and usuing his contacts abroad he found out that she had spent the week with another man. Further digging revealed that she is currently seeing 3 other men 
She's admitted to 2 of them. He intercepted an email from the bloke abroad confirming her arrangment to visit him again in 2 weeks.
She has said she wants a few months alone to see other men and have some space and in that time he is welcome to see other women. She has gone to stay with her family, leaving the children behind (2 young ds's) He flies to lanzerote on saturday for a week and then she will have the kids.
he doesnt know what to do. She has told everyone that they have seperated yet only told him a couple of days ago. Hes devestated.
He doesnt know whether to let her go and have her space and hope she comes back
To refuse and give her an ultimatium and risk losing her or keeping her and having her continue to cheat on him and resent him and feel trapped - pushing her further away
To finish it completely and ask for a divorce and risk losing his boys who he adores (shes a family lawyer remember!) he is worth millions so a pay out would lose him alot of money too.
His main concern are the children, his wife is an occassional alcaholic - binge drinks
He loves her and doesnt want to lose her but doesnt know what to do.
Any advice to give him? Hes been put on anti-ds and his work is suffering. I dont know what to tell him.