ADHD here. That might be related to time blindness or something.
I’m exactly like what you describe. Went years without talking to my dad. Not because I was angry, it always felt like I just spoke to him recently and would talk again soon.
It wasn’t until he died that I missed him.
It’s very weird to explain to people. “I dont miss you because my brain doesn’t recognize you’ve been gone for a while. It thinks that talk we had three years ago was a couple days ago”
Behold the field where I grow my fucks and see it lies barren