Better to say whats on your mind than to keep it bottled up..
Again, here is another opportunity to see what you have in him commitment wise.. . If he wants her out of his life, he'll take the steps to do it, ESPECIALLY when he knows how you feel about her continued presence.. Refinancing her OFF the mortgage would be a big step toward doing so, I'm surprised you even have to remind him of that after all this time..
Hang in there and just try as best you can not to let her push your buttons, as I would venture to guess that is one of her intentions.