[onewhippedpuppy]

I really wonder if it's better for the kids. What example does it send for the kids to see mom and dad frequently fighting and not sharing any affection? For many of the relationships that I've seen end in divorce, the path leading to divorce was very rocky, especially for the kids.

Sounds like indifference has set in with your friend and his wife, which is definitely easier to manage than anger. Also probably better odds that they could have an amicable divorce. Were it me, I'd offer up that "I've been there", and tell him that I'm always available for advice or just to talk. Let him come to you when he feels the time is right.

I hate divorce, and feel that every effort should be made to save your marriage. But at the end of the day, life is too short to stick with bad relationships.