First, a disclaimer: it takes two to reconcile. If you are caught in a vicious cycle with a master manipulator who isn’t sincere and hasn’t heard your voiced concerns, I understand your impetus to disconnect. I also consider you off the hook for the following advice.
If you call an honest person out on something, you must also call them UP.
Offer solutions. Offer humility. Offer honesty stirred up with compassion.
Offer companionship in the recovery.
Offer solid belief in their worth.
Build up. Don’t tear down.