My husband doesn’t want to buy me an eternity ring. AIBU to want one?

[slowsausages]

20 year wedding anniversary coming up. Husband asked what I’d like and I said my only thing really is an eternity ring.
He’s acted so weird (I think) and basically taken offence to it. He thinks that wanting/getting one makes the wedding and engagement ring less special. That those rings symbolise forever and that essentially you shouldn’t need anything more.

I feel kind of offended and sad and let down. Now I feel like even if he got me one I just would feel awkward receiving it and wouldn’t have a good feeling anytime I saw it.
I feel like he’s ruined the whole idea of it.

AIBU unreasonable to feel this way?
Has anyone else’s husbands ever had similar?
I didn’t think it was a big deal and had no idea anyone would or could take it that way?

I completely understand - my DH bought me a fairly cheap gold ring as a birthday gift which I wore on my wedding finger. Fast forward a lot of years and I said I would like a 'proper' eternity ring but he would not really go there, just brushed the subject away or made noises. But no ring. I then came into a little money (he doesn't need my money!) and announced I was going to buy one for myself, which I did. It's a beauty. BUT it has become a bit of a strange but sore point between us. He is just a bit weird about it, and now I wear it on my right hand. I don't really know what has gone on here, but he definitely didn't want to buy one, and definitely didn't like it when I bought my own. 😳