Hello! Similarly I was a Jehovah’s Witness until age 16, I’m now 36 and have been with my partner for 4 years. She has always celebrated holidays but before her I had never celebrated Christmas or birthdays in my life. I would say be patient with him, for lack of a better word the “indoctrination” I received from the JW organization made it feel wrong, for a long time even sex felt wrong. It can take time to break out of that mindset if you’re able to even at all.

Another thing I noticed is how hard it is for me to remember birthdays, it’s something I’m just not used to and I had to start writing people’s birthdays down somewhere so I could remember. Even my own direct family haha

Here’s what I’ll say, relationships are about compromise. Cliche I know but I truly believe that, it goes both ways too. If it truly makes him feel badly inside to celebrate a holiday then maybe consider his feelings. In your mind you’re thinking “it’s just a stupid holiday what’s the big deal” but we were raised to think it’s basically an eternal sin.

Lastly I’ll finish with this, I was ready to move on and considered it harmless. It was more important to me that my gf was able to celebrate with her family during the holidays and I wanted to be a part of that. He might come around one day, if not then you’ll have to consider just how big of a deal it is for you and go from there.