@Bluepinkrex I feel your pain.
I went through exactly this sort of thing with my XW. We never discussed it either - it was just accepted.
I spent 10 years of a marriage without intimacy before I decided enough was enough.
I booked a weekend away (our kids were older teens, and could be left safely), so that there would be no distractions, and once we got settled in the room, just opened the discussion with "what's going on with our sex life?" I wouldn't let her ignore me, or deflect the conversation.
We both talked, and we both listened.
Yes it was hard - for both of us, and there were a lot of tears on both sides, but we were finally honest with each other about what was going on.
We did try again, we also tried couples counselling, but we never managed to re-kindle the intimacy that was missing.
We discussed an open marriage, and me having a "girlfriend", but the reality / actuality of these situations didn't really work for her, so in the end, we decided to split, and to be completely honest with you, despite being one of the hardest things I've ever done, I think it was the best for both of us.
She has her "spark" back - she is more like the person I married. As far as I know, she hasn't had a relationship since we split, which says a lot..
I'm still single - I've had a few years (interrupted by Covid!) of enjoying being single, re-discovering and exploring my sexuality, and have loved every minute of it!
I honestly think that, to save your sanity, you need to do something similar.