Velika - I know you've posted on this before, but re-reading the definition and manifestations, how does ANYONE know that their MLC er is not actually bvFTD? It sounds JUST LIKE MLC, so if there's no way to diagnose it (other than autopsy), I guess we just will never know, right? If they don't realize their behavior and actions are inappropriate and impacting others, where does that put us as LBSs?
I think if you can convince your spouse to see a doctor, a scan may help. From what I have read, it is often very obvious.
However, having read a book about bvFTD, I know that even people who care for family members with bvFTD and then are later diagnosed with the disease do not accept the diagnosis, because one of the first things to go is self-awareness. In this case, you could attempt to find sympathetic friends and your own family members to help. Again, using the right language may help.
If you have children, I would fight like a mama bear to get any type of diagnosis, based on my own experience. Unfortunately, if they are in the early stages and can appear rational, this may be difficult. If this has just started, I would find a lawyer who believes this is mental illness and will advocate for you from this perspective.
Due to lack of awareness, research, and taboos, even better understood mental illnesses are difficult to diagnose, even when the symptoms are obvious. I think I read it can take 10 years just to get a bipolar diagnosis.
Just look at most articles on why people cheat. Manic episode is almost never mentioned, but this is a common symptom of mania.
If you suspect your spouse has bvFTD, especially if you see a family pattern, trust your perceptions. Once you have done everything you can to financially protect yourself and your kids, and barring a willingness to see a doctor, you may just have to watch the situation unfold.
So sorry you are dealing with this.