This is where it gets really tough. You're thnking one thing and you really don't know what he's thinking.
Let me play gadfly here for a minute. If he does move out, what does that mean to you? That it's over and done? That there is no hope? That he doesn't love you or find you attractive anymore? How about that it's part of a process?
If he doesn't move out, what does that mean?
I know these are hard questions and I know the fear in answering them.
Let me tell you a short story. When my H left, I thought 1) he not only didn't love me, but was indifferent to me 2) he didn't find me attractive anymore 3)that I had mucked up everything beyond repair.
None of the above are true. He's been gone 20 months now and the hardest thing I have had to do is forgive myself for his leaving.
Try not to focus on him. Focus on having an amazing Holiday no matter what happens.