Anyone bother to look at the join date.
Read the other threads he started. Read the advice ...high fives you gave him before on those other threads.
Having a 20 yr marriage, history, a family and then Being cut back to a 50 % time, attention, focus allotment what are unrealistic expectation.
Sounds to me like you've put an enormous amount of time and work trying to keep this marriage . Knowing now what you want ....the marriage or relationship you want.. I'd trust your gut go find and build that life.