I believe if the man has children staying with her, he needs to pay child support for the time she has them......at least until there is a legal decision made about the finances.
I want to be understood here. It is not about administering punishment. I believe in most cases a WW will continue going in the same direction as long as someone else picks up the tab. If she said she wants a D and moved out of the H's home to get another place.....then she should experience what life without him will be for her. As for giving her money that would be part of the settlement..........that's just a decision you will have to make. Your job is to provide for your kids, not the wife who left you.
As for just giving her some money b/c she's having a tough time, I would not advise it, knowing the nature of the wayward. Child support....yes. Personal money just to help her out......no. I feel that would be a big mistake.
Ordinarily, I would tell a person to do what they deem as fair. I just think it is difficult for a nice-guy type, b/c he can always find an excuse for the WW and convince himself it is fairness.
It is not about what you feel should work in your M. It is about doing the work that gets the right results. Do what works!