I opened up my own checking acct this afternoon...also got my W's name off my credit card so she can't use it. I'm going to change my paycheck DD to this new acct but I'm still torn on whether or not to transfer 1/2 of our joint account balances.
YES. That's kinda the point -- to make sure she can't suddenly draw down family funds if she decides to bolt. Again, your mantra is "considering some of the decisions you've been making lately, I felt it best to be in control of my own half of our joint funds."
Look, she's NOT going to be happy just about the DD into the new individual account. So you might as well do what you need to do, all at once, and get it over with.