If you come by yourself, it is ok as well. Difficulties are possible to be solved through working with only one partner. However, this will take more time. Also if I get an agreement from you and your partner I can write to your partner a special letter. I will explain importance of being involved in psychotherapy and what benefits are for the relationship. Such kind of a letter will contribute into making a good and right decision, based also on an expert's opinion and argumentation.