He is trying to show her what life is like without him. He can't do that if they spend Christmas together.
Here is my take on this, and I believe it's consistent with DB'ing: if she never sees him then what exactly is it that she's living without? Out of sight, out of mind. In this context I firmly believe limited contact is much better than no contact. If the WAS sees a happy, healthy, independent LBS every now and then, they start to wonder what life with that changed LBS might be like. I don't remember zero contact being recommended in DR except in the "after the last resort technique", and in that instance MWD warns that it may lead to divorce.
