How do you navigate CPTSD with your partner?

My partner made plans on Christmas without me because I cannot travel. He didn’t discuss it with me first because I had been fine in theory with separate Thanksgivings and those plans were cancelled. This triggered some rough neglect and abandonment feelings I thought were long sorted. I don’t know how to explain to him that

1. I know being sad for days is outsized and I’m not trying to make him feel bad
2. This is not his fault but he did make a mistake ( not making a holiday decision as a couple )

I have said all this to him but I’m still sad because of the abandonment issues resurgence so he seems skeptical. Any ideas?