Even the uber wealthy have relationship problems and clearly stacks of cash are not a solution. I wish the Gates family all the best in this tough time but personally feel a bit better about myself and the premise that I'm not the wealthiest person in the world because even if I were it wouldn't solve any problems I may be facing today.
Who said they're less happy apart than they were together? Maybe they're both happier this way.
Some couples handle this in a very professional manner when there isn't cheating involved. We know one couple where they mutually decided that it wasn't love any more so they went their separate ways. They still get along as friend though. So emotionally mature.