JPB wrote: primary focus on wanting the other person to be happy..
Are you sure that you want to go on record as believing that your mate being happy is more important than you being happy? That it is your responsibility to see after your mates happiness? No...didn't think so.
Very few of us know our mates well enough to know what they want in any case, guesses and going by what the other person says is almost assuring that we will get it wrong. Much better if two people go after what they want, try to make the relationship work for them. And yes part of this is doing what you can to keep your mate happy.
In this case we are talking about women who tell their mates that they are leaving, presumably women who are not getting what they want out of the relationship. Leaving is a valid choice, however if they have never fought for what they want with-in the relationship (engaged in power games) I would need to question their courage, as well as their plan for ever getting their needs met in life.
As for the men who cry to them over their leaving, you already know what I think of that.