I was a mental health counselor for nearly 40 years and specialized in working with couples. I wish I could say that I was a couple's first resort...unfortunately, more often that not, I was a couple's last resort. No one wakes up one morning and thinks, "I know what I'll do today. I'll file for divorce." Generally, divorce is something one (or both) partner has thought about, contemplated for a long time. When the option of divorce is finally openly discussed, the partner who is being left pleads with their spouse to give counseling a try. In my experience, the partner who is leaving agrees to counseling as a form of appeasement...so, they can tell themselves they tried everything; so they can get their spouse into seeing a therapist and make the abandoned spouse (and the despair of the abandoned spouse) someone else's problem; to alleviate their own guilt, etc. It was pretty rare for me to have a couple come in for counseling at the first sign of trouble, when both partners were, essentially, still emotionally invested in the marriage. In my experience, by the time most couples got to my office, while they both might be physically present, one partner had checked out emotionally long before I ever saw them. I did not often do marriage counseling; I was more often engaged in divorce counseling, assisting couples in going their separate ways with as little emotional damage as possible.
It was always satisfying when folks came in still invested in their relationship, because then I was genuinely able to help them get to a better place with each other.
This was exactly my experience. My Ex Wife had totally checked out and the counselor knew it. In private sessions with the counselor she suggested that divorce may be the best thing. I think she was preparing me for the inevitable. So moral of the story is if you are already talking about divorce it is probably over.