I know you know that there is nothing you can do to wake your xh up. I also know that that fact is often hard to get your mind around, particulary at times like the birth of a grandchild.
I always say, you feel what you feel. There is no right or wrong way. They are your feelings. They are valid, they matter.
And so, you will work your way through this. And you will come to realize yet again that while you know he is in an MLC, you cannot possibly understand it as you are not in one.
Two years is not a long time considering how long you were married, and that you shared children and grandchildren together.
And you must go easy on yourself. The holidays are particularly difficult.
With each passing year, and each passing life event, the hurt will lessen. Sometimes never going away completely, but, dulling all the same.