The "Shark Tank" host and investor Kevin O'Leary.Roy Rochlin via Getty ImagesKevin O'Leary says couples shouldn't combine their finances.Maintaining a financial identity is vital in case of break up or death, the "Shark Tank" star says.O'Leary advised having separate credit cards, bank accounts, and investment accounts.When two people couple up, they're often tempted to combine their finances too, as it seems simpler and signals they're both committed.But if they break up, joint accounts can be a knotty mess to untangle and might leave them high and dry in the credit-driven US economy, Kevin O'Leary says."What I tell everybody to do in a relationship is have your own account, your own credit card, never merge your finances together," the "Shark Tank" star said in a Fox News clip posted to his Instagram on Wednesday."After you get divorced, if you have been merged in with your significant other, you're a nobody in our system," O'Leary continued.