I've been reading your situation over the past few days. Yours sounds a great deal like mine.
My wife decided 4 years ago to start pursuing a music career. It started interfering with the family and our relationship greatly.
I can say that if you separate, expect it to be a long one. We've been separated nine months and I don't see an end any time soon. Every time I do bring up anything about our R (which is rarely), she still says she is just as confused about what she wants now as she was nine months ago.
So many of your conversations with your husband and what he is saying sound so similar to my wife's.