Well, strictly speaking… No.
Your therapist does not work for either you or your partner, but for the relationship. Another way of looking at it is that your therapist works for both of you together. The purpose of couples therapy is to help you both get to where you want to be. If that is together with love, apart with dignity, or anywhere in between, your therapist can help you get there.
Whether you are newly together, just about to get married, newlyweds, have been together forever and a day, or are ending your relationship: couples therapy is for you both.