You will each be treated with compassion and respect no matter how you are feeling about your relationship at the moment. There are no bad or good guys.
You will come in as a couple, but the most important work occurs in the one-to-one conversations with your therapist. Why? Because you are starting out in different places.
Your therapist will respect your reasons for divorce while trying to open up the possibility of restoring your relationship to health.
Your therapist will ask each of you to see your contributions to the problems and the possible solutions. This will be useful in future relationships even if this one ends.