Couple's therapy (or relationship therapy) is a subset of relationship therapy. It may differ from other forms of relationship counseling in various regards including its duration. Short term counseling may be between 1 to 3 sessions whereas long term couples therapy may be between 12 and 24 sessions.ouple's therapy (or relationship therapy) is a subset of relationship therapy. It may differ from other forms of relationship counseling in various regards including its duration. Short term counseling may be between 1 to 3 sessions whereas long term couples therapy may be between 12 and 24 sessions.