People at all stages of relationships sometimes need couples' counseling. The most productive time to help a couple, of course, is early in a relationship, when both parties are highly committed to each other.
But even cynical partners who are unsure about their commitment to each other can be helped with communication, problem solving, and decision making.
Recently I have been impressed by the work of John Gottman and have incorporated much of the material from the Gottman Institute into my work with couples.