Yes, just like you there are times he has "moved on" and is *fine* with where life is. But, when you think of it, there HAS to be moments, where just like you he misses how things used to be. If not he'd have to be like some empty container with no feelings. And no matter how poorly people think about an ex, I don't believe all these people are completely void of emotions and feelings. I think they ignore and stuff it a lot. I think they have to because it must be so painful.
However, never expect him to admit any of this to you!
The holidays will be hard. Gather your family and friends around and try to find all the "silver linings" and little spots of happiness and good that you can.
There is no arriving, ever. It is all a continual becoming.