Tate, right now your kids are seeing you be degraded and disrespectful. This is your current situation right now. Do you think is better than having separate peaceful time?
I honestly don't know why your DB coach is advising you against telling the family. This isn't some OM from out of no where, this is being deceitful to your whole family. It's causing everyone to live a lie.
I think right now detaching and not taking anything from her or giving anything to her (emotionanally and physically) is your best bet.