Some therapists may not offer marriage therapy, some may even encourage divorce. Some see divorce as a rite of passage and a way to personal growth, but people going through relationship problems might not be able to see they are separating from there partner in the name of personal growth rather than giving things a chance. No all therapists are the same; there are a few guidelines you need to keep in consideration when looking for a marriage counselor.
They should not take sides.
They should help you resolve problems with your relationship rather than help you to walk away without trying.
You should feel comfortable with them.